I wanted a white wall oven, 30 inches, to replace a 27-inch that was in the house when I moved in.  I had new kitchen cabinets built to hold the 27-inch, but be adjustable to 30 inches, and everything is fine.  I do not intend to use any of the bells and whistles, including the self-cleaning function, because I own a parrot that would be endangered.  I did "burn in" the oven as suggested, by running the self cleaning function just once, with my house adequately ventilated and the parrot put into another room with a door closed.  The fumes were quite noticeable, which I imagine is why the documentation warned me that it's a good idea to run the self-cleaning function once before use.