Product review (1 stars): Unsafe and Unreliable
Preheat is very slow, but that is the least of the problems with this oven. This product is not only unreliable, but unsafe.  The metal trim reaches unsafe temperatures in excess of 140 degrees.  I have burned my fingers by simply touching the side of the oven. This was reported to Whirlpool Customer Service, and after losing their argument that the that the oven was incorrectly installed, they had no acceptable response. I have used the self cleaning function three times and two out of three times the oven "crashed" completely disabling both ovens.  I am told that the oven overheats during the self-clean cycle, locking the door permanently. The oven door is actually too hot to touch (burn hazard) when this happens. It took two weeks to get a service rep and another two weeks to order and install parts leaving me without an oven for a month each time.  This oven came with my new home, and I will NEVER buy another Whirlpool product. I have logged over 40 hours of telephone time with issues with this oven (including many hours on hold!).