Product review (4 stars): Industrial strength exhaust
I think it works pretty well. We had some "resonance" issues when we first installed it, because it moves some serious air. It turns out that I needed to reinforce the ten foot high wall it was installed on, and then the booming sound went away. I cannot tell the difference between "3" and "4" (except noise level), but I definitely can tell the difference between "1," "2," and "3."

The grease traps work very well, and clean up easily. The lights work well *IF* you are careful not to cut yourself on the sheetmetal when changing bulbs, like I did the first time. (We are trying out LEDs for longer service life, we hope.)

The one minor annoyance (for me) is that I have to push the "off/on" button too many times. First push activates a three minute timer, which we never use. Second push actually turns of the fan. Then, there is the third push that activates the fan speed buttons, but doesn't start anything. So, when turning it off I push the button three times, so I can just push one button to start the fan next time.