The wall-oven Advantium definitely suffices as a second oven. By and large, so does the OTR version - when used as a convection oven, you can insert the shelf and get extra capacity (IIRC the turntable can be shut off to so you can use the full width of the lower shelf of the oven). When used as a speedcooker, it's fast enough (especially the 240v version, which I recommend) to cook several dishes one after another in the same time you could only cook one item in a conventional 2nd oven. The Advantium can do warming-drawer duty as well. The speed cooking mode works especially well with rolls and bread-wrapped items. If you can go with 24"w or 60cm (23") cooktop and separate oven, you may buy the countertop space you need. Some of these narrower cooktops give you as much cooking space as typical 30"w range - this is done by using very small knobs at the front, sometimes all four are offset to the right so the left two burners can use the full depth of the cooktop, front to back. These often allow a drawer to be placed directly below them for convenient cooking utensil storage. The turntable in the built-in Advantiums is 16" round. Don't have the dimension for the OTRs, think it's around 13". There are alot of imaginative layout options that solve insufficient space problems - i.e. I've used undercounder freezers, sometimes the drawer type, paired with a 30" or 30"w separate all-refrigerator rather than a 36"w side-by-side fridge/freezer to buy an extra 6" of countertop space,, and the aforementioned separate 23"w cooktop and undercounter 24"w oven to buy another 8" of countertop space (see my May 22 post in this thread).

I attached a picture of our install - the kitchen aid over the LG wall oven. After 4 years we are moderately happy with the kitchen aid but it is outclassed by the LG, by comparison, and when we purchased the kitchen aid was the only component I purchased extended warrantee on, based on reputation. The KA is the 240 volt version and it works just fine. However, it really is somewhat outmoded by more modern appliances. I chose it at the time as I needed a flip- down door and in the price range there were only two micro-convection ovens that I could find We have not once used the steam function. My wife has never used the convection. (Except when we have guests and she asks me to set it up as a warming oven. The controls really are not intuitive for this - all temperatures are set for a timed count down.) The neighbours across the street just bought stacked GEs, with the Advantium on top. They are extremely happy. Seeing what they have confirms that I should have bitten the bullet and gone for an Advantium myself.

I have a Sharp convection microwave, but mine isn't OTR so I don't know about vent capability. I think they have an OTR version. Mine has only one tray that is used microwave or convection. There are some metal racks that can be used if needed in convection mode, but I don't keep them in the MW so no worries about DH or DS using them in MW mode. I love having the option of using the convection for small items or as a "stealth" second oven in the kitchen. HTH

I, have the Profile convection oven. Great for the holiday's. and for every day use. I, use it a lot living in Arizona, not wanting to heat the house in the summer. It work's really well. It get's lot's of use. I, think the Advantium, cook's thing's faster. You, could go on the GE web site and compare them, or call GE and ask.