Product review (4 stars): Broan QS230SS Allure II 30-Inch Under-Cabinet Range Hood, Stainless Steel
A beautiful range hood unit once installed.  But installation to a 7" round ducted vent turned into an all-day job. I would have given a rating of 5 stars but:

1. Damper was provided for a 3x10 vent, but NOT for a 7" round vent. This was a surprise "not included" part disclosure hidden within poorly written instructions.  This part was not available at Home Depot or Lowe's, and can only be ordered online from various parts retailers. I needed one now so I had to creatively use the damper from the old unit I removed. Then, I had to made some modifications in the duct pipe to widen the mouth.

2. Instructions show unit being installed without range being pulled out since it calls for electrical being hooked up before mounting under cabinets, noting you should protect the range with cardboard. What a joke! This unit is heavy and takes two people to line up the mounting screws and insert into the duct pipe at the same time.  Took several tries until all four screws and vent connected adequately. The vent pipe ended up at a slight angle since the hole in the new unit was not in the same location as the old unit. The two left mounting screws are hard to see and requires a long screwdriver due to fan housing.

3. Wiring connection is on right side - top or back.  My old unit was on the left back, so I had to put another hole in the wall and pull the wire over to the new location. Oh, you'll also need to furnish your own wire connector clamp for the cutout in the new unit.

It was quite a day for me and my wife and was I sore allover the following day. But it was worth it since it looks good and performs well. But if I had to do it again, I certainly would hire a handyman to do the installation!