Product review (4 stars): Almost perfect
I found this based on how many people mentioned this brand for quietness, even on other product reviews. Then I saw that Broan is the same company as Nutone, the brand of the 30 year old unit I was replacing, so that sealed the deal.  This unit fit perfectly into the under-cabinet space and the mounting holes lined up.  My only problems with the installation were due to the previous one, where bolts were used for the front mounts, so screws would not fit because of the hole through bottom of the cabinet, and the funky 10x3 homemade sheet metal fitting in the old duct work, which was easily replaced with a $5 fitting from Home Depot.  As others have mentioned, the 1/2 inch wood screws for mounting this looked rather inadequate, and considering my cabinetry has a 1 inch lip around the bottom, I ended up having to get much longer bolts and screws to complete the installation. Other than that, there were no issues setting up the unit itself, though some of the directions could have been a bit more clear.  For instance, it took a while to figure out how to assemble the block for the recirculation vents, Just a few words about slipping part A through the slot in part B to align and click into place would have been useful.

The fan is extremely quiet on low operation.  On high, it is strong enough to pull the flame from the burner towards the center of the stove, even with a large skillet on top.  That said, I wish the design had the fan, or at least the screens, further forward, as I could see smoke getting sucked in through the light fixtures towards the front when frying fish. Perhaps a design with a lip that trapped more of the smoke rather than spilling it up into the room would do the trick.  As it is, there is still some smoke that escapes the draw of the fan, though certainly far less than the old unit, even before its fan died.

Finally, the other thing I'd like different would be separate switches for the lights.  Even on low setting, those 50 watt halogens are very bright and they run hot.  I don't need both on when just cooking on one side of the stove or leaving on as a night light.  I may just use one bulb instead of two, though given how much smoke I saw drawn through the light fixture opening, I'm concerned about greasing up the light socket if it's empty. It's too bad that LED's are not recommended for this unit. For the price, however, and ease of installation, this is a good unit and I'm pleased with it so far.