Product review (5 stars): Excellent hood but not to be installed by the novice weekend warrior.
After having to replace the microwave hood, we decided to find an alternative that did not obstruct the space above the range as much.  We researched many of the  products available at the big box stores and were not terribly impressed with selection.  We were looking for something with 400 + CFM and that had a relatively low profile.  Until my wife found this product, I had never heard of Zephyr but was drawn to the design of the hood and its advertised capabilities.  After receiving the product I was impressed with the relative construction of the exterior and was quite pleased to see the high quality of the mechanical components within.  I had already primed myself for a tough installation after reading the reviews so rather than trying to perform adjustments and fitting on the wall, I removed the top cabinet (mostly because I had to realign the opening for the duct work) and pre-fitted the two components on a table.  I also changed the installation hardware and went with 2.5" machine screws fitted with the largest washers I could manage in the spaces.  Doing this ahead of time made the actual mounting process a 15 minute chore.  In summary, take you time with the installation but be prepared pull out your extra long screw drivers and definitely secure an extra pair of hands.
Functionality is great but please note that moving that much air also creates some noise at the higher speeds.  The hood is definitely capable of doing the job and I can't see using the higher speeds for the average meal. The controls are very easy to use and they do not feel cheap like some of the others I have sampled at the store.  Overall we are very impressed with the product.