The Advantium is on my list as well. It works as a second oven, MW, or speed oven. You need to switch out some kind of bottom tray for it to go from MW to oven. The only issue is you obviously can't use it as a MW when you're using it as an oven.

I do use the microwave alot so that might be an issue for me -- having the Advantium tied up when I want to use the microwave for 30 sec.

Is there such a thing as a double oven, but one of the ovens is smaller? Kind of like the double oven ranges where the top oven is half the size of the larger oven?

I'm going with an Advantium over a trivection oven, so maybe everything will bake/cook/micro so quickly, I won't have a conflict:). GE (maybe Profile?) just came out with a single/double wall oven, kind of like you described - it's the size of a single wall oven, but has two ovens, with one bigger than the other. I thought of getting it, but I wasn't sure my pans would fit... plus I didn't want to buy the first version on the market. Good luck!

We have a range (with a single oven) and an Advantium 120, and it works for us. We have 3 small kids and I cook frequently, and on a everyday basis we are fine. That said, we're going to be moving into a house that we are renovating, and in that kitchen the plan is still to have a range and an Advantium 120 (but one of the new ones with the rack, which I think is very helpful) but also a Gagg Combi-Steam. For when we entertain, I think the extra oven will be especially helpful. (Plus we are starting from scratch so I can create room wherever I need to.) With our current configuration, I just need to make sure I think of timing ahead of time for those big entertaining occasions or holidays. In those instances when both the range oven and the Advantium oven are in use, I tend to use the stovetop to do things I might normally do in the Advantium's microwave (like boil water or melt butter).

One drawback to the old Advantiums (and I don't know if this has changed in all of them - I'm looking at the Monogram 120 version) - the bottom is a turntable (that on mine cannot be turned off) so whatever pan I use must fit on the turntable. That is why I like the design of the new ones with the rack so much - it's a more flexible design. Good luck!

I love this subject. As much as I love the look and performance concept of two ovens, I can't commit the space or resources. Here is what we are doing:

1 wall oven (probably monogram)
1 krups fbc-4 toaster oven (there are many reviews on amazon)
1 microwave, plain for now, but may upgrade to panasonic genius prestige convection microwave based on needs.
1 solar oven (not sure what model yet)

Why am I doing this? Like many people, once in a while I could really use two ovens, but it's not a frequent need. My toaster, which I love, has a convection oven feature that works well. It does great brownies, pies, and small cakes/side dishes. It fits my largest diameter (10.5 inch o.d.) pie dish easily. The rectangular inner dimensions are 12" w x 11" d, with nearly an inch bumpout in depth in the back, but I would leave that open for air flow. Anyway, what I learned this thanksgiving (I never paid attention before because I wasn't designing a kitchen) is that the turkey and the pies bake at vastly different temperatures, so I did need another oven for the holiday. But, the toaster oven fit the bill. I figured, if I could make it through thanksgiving on this setup, I could get through just about anything that might come my way. So, I am going with this combo. As the years go by and the number of bakers in my kitchen grow, I can upgrade my microwave to a convection unit if necessary too, but since I'm doing freestanding, I won't have to change my cabinets.

I just wanted to mention the toaster oven, because when you're using it as an additional oven, you still get the use of your microwave.

So, that's 4 baking options, 5 if you count our bread machine, all without a double wall oven. Not a solution for everyone but I thought it might be worth mentioning.

If you click around in the links, some of the information about the use of solar ovens in refugee camps is heartening, and gives me hope for the future of the world. It's worth it to me, both in terms of electricity saved, and in setting an example for my kids, to master the use of the solar oven. Plus it doesn't take up any space in my kitchen or make it hotter in the summer!

Here is a link that might be useful: More and more solar oven options out there