Product review (4 stars): Sucks the stink off a dead fish
Just installed this to replace a 300 cfm Kenmore elite (Braun, I think).  The Kenmore was internally vented and relied on carbon filter inserts.  There were always kitchen odors and the cabinets above the hood would get coated in grease.  1. My wife and I cook a LOT.  We put a pretty heavy demand on the hood.  2. The Kenmore could be vented internally or externally.  I was told it would work well internally, but I should have known better.  I suppose I could have vented that hood externally, but if I was going to that amount of work, I figured I would install the 600 cfm Proline.

I'm happy with the Proline.  It was not much more expensive then the Kenmore.  It has twice the cfm rating, yet is not much louder.  It will suck the stink off a dead fish - literally.  Smells worse outside than it does in my kitchen.