So far no problems. There doesn't seem to be much difference in the convection vs. air fry vs. bake selector. The fan seems to run regardless. Also for a "pro" range it is strange that you can only select the temperature in 25 degree increments. This isn't really precise enough even for a home baker. I'll have to read the manual more closely, maybe there is a setting that can be changed. The oven is very well insulated. Compared to our old one it stays warm for many hours after use. It also pre-heats very fast. Two timers which is nice. Range top is very fast and many burner options to choose from. Very fast light and decent modulation of temperature.