I have the previous model of the GE Cafe dual fuel range. I have used it both in convection and regular bake mode, and did not notice a difference in fan noise. The fan runs continuously regardless of whether it's in convection or not. I don't find the fan noise to be particular bothersome. In fact, I never even really noticed it until I started seeing people posting about it here. Now I do notice it, but mostly as background white noise that I don't really hear until it shuts off, and then I notice it is suddenly very quiet in my kitchen. Everyone has a different threshold for noise. I have a busy household with four kids, so maybe I tolerate more noise than others? The fan does not seem to be any louder than the exhaust fan I have (I don't have a range hood yet - current have an OTR microwave that eventually will be replaced with a hood). I wish I could comment on the length of time to preheat the bottom oven but I actually haven't even used it yet (I've had my range for about 9-10 months but did not host any holiday meals here this year so haven't needed it). Right now it is storage for my cookie sheets and baking pans. If I remember, I'll try to test it out tomorrow for you. I've been very happy with my range. I was able to see it in action before I ordered it because one of my good friends has the AG version (same older model). I'm bummed I didn't wait another year and get the new model with the 20K burner, but mine suits me just fine w/o.

I got a DCS duel fuel range with five burners. I usually use the center burner only. It is much easier to clean up and the grease and grime are kept in the stove top and not on the surrounding counters and front floor. I use to clean up everywhere but with doing cooking at center burner; it makes cleaning much simpler and quicker. I do wok cooking mostly!

"Commercial bakeries use nothing but gas ovens." This is not true. If you are talking about bulk bakeries, they are more inclined to because it is often cheaper but they also have steam injectors to add humidity when needed. I know several specialty bakeries that use electric ovens. Many deck ovens in commercial kitchens are electric. I knew of a bakery that was called "the Electric Bakery". It really depends a lot on what they are baking. I know a baker that has specialty ovens for pies. This really has nothing to do with home ovens because they are a different breed anyway as they are expected to do many different things. "Dual fuel is excessively expensive, and overly complex for no benefit in performance ." Performance is different things to different people. They have different needs so there is no one size fits all. If I were selling appliances, the first thing would be to assess that person's needs and make individualized recommendations based on those needs. I most likely would never recommend ranges to begin with unless there was a compelling reason like space or cost issues or even a preference for "looks" over cooks. Pick out each component because it meets individual needs in the best way possible. As far as cost, you can buy electric ovens with features that have high utility for less than some gas ovens with limited features. Electric ovens can be complex, but so are our home computers and cars these days. This is not necessarily a bad thing. These ovens can have features that many consider helpful in how they use their ovens. It takes a computer board to coordinate fans, heating elements and tight temperature control. I love being able to control the direction of heat and fan speed in my oven. I can have air movement slow or fast to facilitate browning or not if I am baking a cake. It has a lot greater range of temperature, with or without the fan than many ovens gas or electric that cost a lot more. There is a learning curve with these features especially with the many choices something like Gaggenau or Miele give you. The combi oven is the king of control of the cooking environment but not in a range yet. The other side of the coin is some ovens have this figured out and others, not so much, so you have to read as many reviews as you can. To minimize risk if you want these features, buy the longest service agreement that you can. They can be difficult to evaluate and compare because a feature named the same name in two different brands can mean two different things. Even the term "dual fuel", in most ovens it means gas burners and an electric oven but 5 Star when they say dual fuel means a gas oven and electric oven together in the same range. You have to decide what is a benefit and what is a burden? No one answer. "could you please explain why all gas is fine" "All gas is fine." I might agree with that statement depending on how you use your oven but that in no way means they are the same and it in many cases gas is not the best choice. Gas and electric ovens are constructed differently. Because you have combustion for your heat source, another difference, gas ovens are vented more to remove products of combustion including water, so those products of combustion and humidity from food move out of the oven and into the kitchen. That may be good or bad depending on where you live, but how is that significant to cooking? It is much more difficult to keep added steam in a gas oven if you are doing that for bread or adding a pan of water for cheesecake. Because there is more of an air current, in a gas oven, this removes more moisture from the surface of what you are cooking. This inhibits starch gelatinization during the first part of baking so inhibits rise and changes the appearance of what you are baking. On the other hand, because it evaporates moisture from the surface and allows it to heat more quickly, the Maillard and other browning chemical reactions take place more quickly. This is why meat, vegetables and even baked goods brown more quickly. Will you notice? A lot of people say they don't. I have baked in gas and electric ovens for over 50 years and I used to attribute differences in outcomes to different ovens rather than a difference in fuel but with the many books and websites that have come out on food science, you can see the rationale for the differences in outcome that cooks report in cooking/baking forums. It was kind of a "aha" moment to put these comments with the science. All of the information coming out challenges what used to be conventional wisdom and yet it might be hard to see if you are not baking the exact same recipe side by side. You do see the same observations cooks make repeatedly in terms of cooking on cooking and baking forums and people seem to notice the difference more coming from electric to gas but you do see the occasional comment about excess moisture in some electric ovens when they are coming from gas. Most advertising literature and websites about ovens actually say a gas oven provides moist heat and electric dry but they are only looking at the heat source and not the oven as a whole and the process of cooking which provides a lot of moisture to the oven chamber. Another difference is that there are more and more features being loaded into ovens now as noted above, mostly electric but sometimes gas too. Some electric ovens have added steam. Combi ovens are very useful in their ability to control humidity and really make the case for buying ovens separate from the range top instead of having to pick the priority of the burners or the oven. I am not a fan of the current trend of hiding the bake element in electric ovens. Sometimes with pies, you need that bottom element exposed. It used to be you could put a tray under the element to catch spills. If you put it on the bottom now, it will melt. Some other things to consider. gas broilers are of two types. There is the traditional gas broiler, but they are not very good. Many prostyle gas ovens have an infrared broiler. They are very hot and even, but can be small. They are great for a couple of steaks but not so much trays of appetizers or broiling larger amounts. How big is the oven? Do you want a quick preheat or need room for full commercial sheets? Look at the rack size for usable space and size top to bottom. What is the temperature range, lowest and highest? What are the increments that you can set your temperature? 25F or 5F? Ovens are not an easy choice these days but I think it helps at least some people to realize the differences so you can at least make a somewhat informed decision.

@Heather Spencer I'm not a pro but I dove into the ventilation question a bunch when I was looking at what to do in my own kitchen. There are a ton of posts on it here, too. ventilation is pretty location dependent as far as what you can get away with, but what you should do is use a hood that's sufficient for the range you buy, and provide the makeup air system that's required for it. If you are anywhere that has cold seasons, or if you live in a tight house, you need to have makeup air. Passive systems work in temperate climates, but not so great in cold climates. The makeup air system is designed to prevent a backdraft situation with combustible appliances. In a cold climate with good insulation, houses don't leak, which means your hood vent will suck more air from your house than can be replaced by leaky doors and windows, causing a dangerous situation. The higher the CFM, the harder it is to replace the air without a system in place (gas dryers, gas water heaters, gas fireplaces, and even bath fans contribute to this calc). For a 48" range you need a serious range hood (Wolf recommends 1100 CFM for their 48" range if I remember correctly). Anything over 400 CFM typically requires makeup air. I ran through the calculations in the code in my state when I was trying to decide on a range and found out that it didn't take much to throw me into full makeup air system, so I decided to go with induction. If you choose a 48" range and pick a lower CFM range hood, you'll end up with smells and smoke, unless you just have the range because it's pretty and don't do more than boil water or make grilled cheese on it. So, in order to do it properly, it costs money. More in cold climates, where makeup air needs to be heated. Less in temperate climates. My builder estimated about $5-6k for the makeup air system (not including hood). I priced out what I would need from fantech, and it got me close to that number. So it is true that the ventilation + hood can be as much if not more than the range itself. ETA: this isn't specific to 48" ranges - Wolf recommends 500 CFM hoods for their 30" dual fuel range, so it's more about the power of your range than it is about the size of it. But generally the bigger your range, the more power it has.