I bought this double wall oven to replace a Thermador double wall oven and have been extremely pleased.  It takes a very short time to preheat and cooks evenly and efficiently.  I have only used the air fry feature once, and was not entirely thrilled; however, I am new to air frying so I am sure I need to experiment (would have been helpful if the manual included a "how to").  I would award 5 stars if the oven lights and timer worked 
independently for each oven rather than for one and if the clock would hold the correct time (have to constantly adjust the clock, even using the app).