Product review (4 stars): An evolving review
Here's where I'm at now ... I just did a test mount on the wall for positioning.  Some initial thoughts - its a nice looking unit.  Appears to be fairly well made, pretty solid, and simple construction.  So far I like it.  Instructions are a joke, and I haven't entirely figured out what the included hardware is for.  I mounted this with toggle bolts - which did not hit any studs, but I had a stud that was nearby so was able to pretty simply drill a hole thru the mounting portion of the unit and add a third point to secure it confidently into a stud.

Interesting that the instructions specifically say to only use this with metal ducts no plastic - though included in the box was a plastic duct pipe.  I'm not sure why they even included it and frankly its kinda dangerous to include it because plenty of people will assume it is safe to use.  I didn't expect it to include ducting that I'd need - but I don't know why they included ducting you cant/shouldnt use.

I plugged in the unit and turned on the fan - and wow.  This thing can move alot of air.  Sound level is appropriate, not whisper quiet, but acceptable.  I feel very confident that this unit will provide more than adequate exhaust.

The absolute best thing so far about this unit is the buttons.  I was very very surprised to find that they used touch sensitive buttons.  My brand new $1000 range doesnt have these types of buttons.  Not sure how to describe it, but its not what you'd think - its not the typical squishy button behind a plastic panel.  Its essentially touch sensitive - you can gently place your finger on the 'button' and it turns on.  I'm very happy with this feature, it feels high-end, frankly I'm a little pissed that my other new kitchen appliances don't have the same.

If you already have a duct to the outside, installation will be less than an hour.  The manual says to have 2 or 3 people to help, I did it on my own. A good tip is to take cardboard (some perfectly sized ones in the shipping box), trace and outline as well as the mounting holes.  Then you can hold this up on your wall, level it, and drill your holes and mount your toggle bolts.

The installation instructions are pretty terrible, I actually went to homedepot website and just downloaded the instructions for a similar looking product (completely different brand) and was able to find more intelligible instructions and tips on installation.
I intend to update this review as I've gotten some use out of this unit.

---Update, a couple months later----
Still very happy with the unit.  I haven't quite figured out the gas sensor function, not sure if its a safety function or a functionality thing.... but it wasn't important to me anyhow.  Units works well, its not whisper quiet - but does a really great job exhuasting fumes and heat.  My old hood was fairly useless, this one I switch on almost everytime I cook or bake - just to get the extra heat out of the kitchen (it's summertime now).  By looking at the breeze that comes out of the vent outside, this thing moves quite a bit of air.  I really love the touch sensitive controls - did I mention that already? I had a party recently and got a couple of compliments on the hood specifically.

One additional note on installation - though I said I did it on my own - it really would be good to have a second set of hands to install this.  No fault in the manufacturing or quality of the product, but I actually bent/ripped the steel a bit - it was on the seam of a back corner, pretty much impossible to see in the spot mine is in - but this was caused by me balancing this thing and having it half supported and letting it twist on itself.  Its not flimsy at all, so don't let this comment deter your purchase - just reiterates that a second hand will be helpful in the install.

--Update, about two years later--
This unit has served me well, but to my surprise it started to freak out on me out of the blue.  I came home one day with it going thru this wild cycle on its own, beeping, flashing, fan on, off, etc.  Other customers have mentioned this, and as others pointed out it's a faulty gas sensor.  If you don't know what to do this could really ruin your day, because it's not like you can easily unplug your hood, and this thing would NOT turn off.  Removing the sensor stopped the craziness.  You simply take out the filters, and right in the middle of the front there's a little unit that's covered by what looks like a speaker grill. Follow the wire connected to it and simply pop it out.  I called the company and they verified that this is the problem, but they do not have a corrected sensor and they've actually stopped using then. Believe it or not, this does not affect my review.  I literally never used the gas sensor function or understood it's purpose. The unit functions just fine with it disengaged.