Product review (2 stars): costly to repair
I had this for about 7-8 years now.  I did not buy this from amazon.  I got it from appliance store when this model was still too high end for homedepot, it still may be.
Until now it has worked well.  I especially appreciated the filter screen that is strong and easily cleaned. #1 fan speed can't be heard at all, although almost useless while cooking.  #2 speed is acceptable, and #3 is a hurricane.  #4 is scary.
What is my complaint and disappointment?  I just disassembled the control circuit board, because #1 and 2 switches had stopped working.  "Living" with #3 would've been major inconvenience.  Took out the circuit board and pressed the switches and they made that click sound.  Reconnected the plugs and it turns out switches were still working.  Maybe the problem was the plastic screen not making enough contact with the switch.  I removed the plastic screen, kept the trim, and now I can directly push on the switch, and all is well. Replacing the circuit board (plastic screen is not sold separately) costs about $200.00 at repairclinic.com.  The little square switches are not sold in general electronic supply stores, and so far I have been unable to find a store.
BTW, the #1 and 2 switches were beginning to show problems about 3 years ago.
If at all possible, avoid the appliances with switches under these plastic screens.  These mini switches maybe impossible to find, and they are not robust.  I was lucky that my switches still work, but I also have a dehumidifier and its control board had to be replaced.