I'd rate this oven 5 stars but I've used the lower oven only twice since it was installed in September. The upper oven has met most of our needs. It is huge as a microwave and can heat a very large, or several smaller, dish(es) of food. Best of all, its convection oven setting nearly eliminates the need for a larger oven. I love the even temperature it keeps during the baking cycle. Food gets perfectly done -- no burning or underdone dishes. It took me a long time to try baking anything on the glass tray -- instructions weren't clear enough for me to trust that it wouldn't break --   but once I did try, that opened up a new world of experimentation. I'm really glad we chose this GE product.