Product review (4 stars): Great hood, but need some improvement
We have installed the hood 3 weeks ago by ourselves. The vent duct we installed is vertical,  goes via kitchen cabinet, attic and roof (We got the hood at Lowes, but vent duct, roof cap, flash were from Homedepot). The instruction is clear,  easily to follow.  I and my wife are very happy. All odors after cooking now are gone.
Pros: This is a great product. Looks very sleek with 4 fan speeds: three first speed (up to 300cfm) was quiet, the Boost speed - 430cfm is a bit noisy, but that is ok. The halogen light range (3 levels) is great.

The cons are: The inner case is not sealed well so not 100% air escapes outside. We put a a duct tape in the top to prevent air get back to the kitchen. Some air still gets back via two holes in the left and right edges.