Product review (3 stars): not what you'd expect (positive Update Jan '14)
We've had this oven for nearly a year. It has never performed well.  The upper oven runs cool, the lower oven does too. Turn both on at the same time and they both are WAY too hot. All these temperature adjustments make it hard to cook large meals.

Also the ovens do not heat evenly. Halfway through the cooking time I have to rotate my pans so that everything cooks evenly.

The oven fan comes on if the oven is on and runs for approx 30-45 minutes after the oven has been turned off. The microwave fan comes on automatically once the bottom of the microwave has reached a certain temperature and runs LOUDLY for 45-60 minutes after all burners/ovens have been turned off. Yes that means TWO fans running while you try to enjoy your meal.  The bottom of the microwave reaches the "auto fan" temperature quickly and easily. One oven at 350 and one burner on low/med and the microwave fan WILL come on and stay on.

It's nice to have a double oven in the same amount of space of a single but this needs to be redesigned.

ETA: upper oven set to 350, once it finally reaches that temp, turning the lower oven on to 400 will cause the upper oven's temp to jump to 460, then drop to 360, then increase to 390 over a period of roughly 10 min.  Eventually it does return to the set temp but a 100 degree shift in temp over 10+ minutes does not seem reasonable.

UPDATE: It's now January 2014.  Our issues with the oven never improved.  The top oven would not hold it's temp, the oven fan was loud and stayed on for a long time (separate from the microwave)... I used the upper oven as a warming drawer only.  After another particularly bad experience with the repairman, we requested a different person come out. New repairman agreed that our oven wasn't functioning correctly. A replacement was delivered 2 days later.  The replacement oven is SO MUCH BETTER.  The fan is not loud at all and  the upper oven holds it temp.  And when I have the upper oven set to 350 and turn the lower oven to 450, the upper oven's temp stays about the same (a slight fluctuation but it corrects itself quickly).

We must have had a bad oven the first time around. Same model number and everything, but this new one is exactly what I expected :)  I'm going to increase the stars from 1 to 3, I would rank it higher but for the horrible experience with the first repairman. He continued to insist there was nothing wrong and discounted every single issue we brought up (including the 100 degree shift) as being within GE's acceptable range.  I realize not everyone will agree with me taking away stars based on the experience with the first repairman, but his actions and lack of knowledge regarding the oven's issues DID impact our overall experience.  Hopefully GE will take our complaint and use it to improve the way future calls are handled.