I just had this installed by a contractor. When he turned it on, it started vibrating and sounded like a B-17 WW II bomber starting its engines. The motor/fan is so unbalanced that it can't even be operated above the "low" setting without fear of it coming loose from the ceiling. One would think that when you buy an expensive premium brand from a leading retailer that it would have been subjected to some sort of quality control inspection and pre-shipping operational checks to ensure that it operated perfectly. Apparently that is not the case with Kitchenaid. Now I have to call for a technician to come and troubleshoot the problem and either replace the motor/fan or the entire unit. This is a consumer hassle that should not happen! We did not purchase a cheap brand because we did not want to deal with a situation just like this! Yet here we are! If it's any consolation, the LED and ambient lights works well. This is very disappointing.