The Shark Navigator works very well-I especially like how the canister comes off to do corners, walls and ceilings with the long crevice tool.  It's a little heavy (12 lbs) but moves easily.  The canister empties from the bottom, which is a lot less messy than pouring the contents from the top and having the dust fly up into the air.  The price was $30 less than BB&B and shipped free, which is a plus.  Assembly was a breeze, too. And , it came with lots of tools.   Overall, a great product at a great price!

Pros: great value/easy to use
Cons: a little heavy