Product review (4 stars): Good so far
Installed using overhead screws in lieu of wall bracket. Takes 2 folks to install, but not a big deal.
Lights worked fine for a week and then one stayed on all the time.and the other was off all the time.  Called Broan and they referred me to area repair shop.  Broan said it would be warranty work.  Shop asked me to turn off circuit breaker for 10 sec to try to reset the circuit(?)  board.  I did but it did not do anything.  He said he would order board and come and replace it.  Scheduled next week.
I got exhaust duct (thru roof) hooked up and tested with decibel meter.  50 db on low speed and 75 db on highest speed.  Loud but not unbearable.  I plan to experiment and add some"framing" around the ductwork in the cabinet that the duct goes thru to see if it helps on the noise.
Regarding the lights changout, buy the orange or yellow neoprene coated gloves at HD or Lowes ($1 a pair in 5 or 10 pack).  Best investment you will ever make.  Light change out, and lots of other work made easier by wearing these thin gloves.  I wear them all the time when I do lots of projects.
Have not tested it under fire yet with 20,000 btu gas stove burner.  I'll give later update.