Product review (5 stars): Works perfectly!
I just got around to using my vent cleaner today.  I am impressed!  $40 (I bought an extension set too) and my vent is thoroughly cleaned out!!!  Saved me a bundle on just this first cleaning and the savings will only go up and up and up with every time I use it!  After reading about people losing the brush head in the vent, I was a bit paranoid and hit up the threads of the brush head with some blue Loctite for added insurance.  My cleaning went off without a single hitch.  I would recommend this to anyone that has a DIY attitude and is capable with a power drill (DO NOT FORCE THE BRUSH HEAD!!!!!).

I would buy this again for sure...