Product review (5 stars): Really nice!
The wall my stove is located on an internal wall that is 25 ft to the nearest external wall, so a real vented system would be too costly ($6-8k) to install.  I was very surprised this unit does well with odors and heat.  Installation was straight forward - I recommend two people.  The vent on high is fairly quiet - not to bothersome to have a conversation while it is on.  It is super quiet on low and mid speed.  The lights (50w) halogen) is really nice.  My only concern is a small amount of flickering when the light is on high and the fan is on high.  It is not enough to not to use it in the highest setting.  I notice it but my wife does not :)!  (BTW, we also ordered a custom cut thick stainless steel "backsplash" for less than $95 and it is super nice!)  It helps to illuminate the stove-top that much more!  Broan charges $350 for theirs (although it is nicer and offers a shelf).  I cannot say how long the charcoal filters will last...  we ordered three sets with this unit.  The filters are EZ to install!  How well does this unit work to control odors?  My wife cooked bacon under it and I didn't notice until I was in the kitchen (we have a semi-open home architecture).  While this unit does not compare to a real vented system, it may be one of the best re-circ vents around.  It does have the option to direct vent as well - both vertically and horizontally - if your cooking surface is located against an external wall.

Update after over half a year of use:
I have purchased a total of 5 sets of filters from here on Amazon... (my wife loves to "pan sear"- which to me its more like pan deep frying). We replace these about every 3-4 months when the indicators say so. Clips are included with every set and like others have mentioned, for under $18 for the set of two. Since it has been more than half a year since I've installed this unit, I am thinking of posting a video for this item. I would have really liked to see and HEAR what people are saying about the sound issues. What in the world is a SONE? (Just kidding, after a lot of online research I learned a lot about these kitchen vents/systems.)