Product review (5 stars): Good quality and quiet. Not flimsy. Not noisy.
Quite frankly addressing the main complaints about the Broan QT230:

Yes, it's flimsy... right out of the box. If you install it properly, it is as rigid/solid as your wall and cabinets surrounding it!!

Yes, it's not completely silent. The motor hums... Quietly. Anything with a motor that moves a fan that moves air will create some noise. This range hood makes the noise that Broan says it will: 1 sone to 4.5 sones, low fan to high fan.  (For those hearing more than that, check your duct work: loose duct work or gaps in the duct work will cause rattling and whistling, increasing the noise level. Also, if your fan is ducted out, make sure the included plastic strip is installed blocking the room duct. It goes directly behind the decorative logo on the front of the range hood.) This range hood is much quieter than the microwave/hood we replaced!

Installation is simple and straight-forward. Along with the removal of the microwave/hood unit we had and the adaptations we needed to make, it took my husband and I about 90 minutes to install it.

I like this range hood uses incandescent bulbs. I dislike halogen and fluorescent lighting without even considering the higher prices. The 2 40W A15 appliance bulbs this unit uses ran me $2.50 total. They are positioned at the front, in the middle, and light up the entire stove surface very well.

Bottomline:
It is a well-priced, easily installed, solid range hood that looks nice and does a great job. Can't really ask for much more.