Product review (3 stars): Not the best oven for avid bakers...
We purchased this double oven and had it installed in November 2013. We were very excited to see it in place! It looks great...very professional. But it takes a l-o-n-g time to pre-heat (10-15 minutes), and then the temperature drops precipitously when you open the oven to place your baking/roasting pan inside. The oven DOES NOT show in its LED readout that the temperature has dropped...just shows the ideal temperature you have set. The only way to find out that the temperature has dropped is to press OFF on that oven, and then restart it. Only when it's restarted (in regular or convection mode) does the readout reflect the actual temperature inside the oven.  Ridiculous!

One other problem of note is that the sides of the baking pans cook hotter. When you bake cookies, for instance, the cookies around the left and right edges of the pan will brown much quicker than those in the center.  This is because the oven, as designed, cooks best in the middle.  The thick walls of the oven intensify the heat, so things cook faster/hotter to the left and right sides of the oven.  I've tried to solve this issue by these methods:
1. Using smaller baking pans.
2. Rotating the pans half-way through baking (and checking the temperature after closing the door again).
3. Placing pans in the oven so that the long ends go front to back instead of side to side.
4. Not putting cookie dough at the edge of the baking pan. You'll have to cut down the number of cookies baked, but the ones in the middle will bake more evenly.
5. Only baking one pan at a time.  (This is what Kitchen Aid recommends, though they promote their oven's even cooking capability in their manual and literature.)

It is a pain to have to constantly watch while baked goods bake. I've never had to do this before with my GE or Frigidaire brand ovens.

I am hoping Kitchen Aid will give us a solution to this issue. Their manual does not address the temperature fluctuation issue anywhere that I've found.  Or on-line.

My advice: Find a different double oven to buy. This one is pretty, but is not meant for bakers.

Suggestion:  If you like the Kitchen Aid look, then you might want to take a look at the Thermador brand. These ovens look the same, but the heating process is more dependable.

Good luck!