Product review (5 stars): Excellent tool
I never expected to enjoy cleaning my dryer vent but it was very satisfying to see years (yes, years) of dryer lint churning out of the vent.  I didn't use the vacuum attachment but found that it worked very well without it though it probably would have been better if my shop vac could reach the vent.

I had no problems at all using the drill attachment, but one word of advice, make sure you don't accidentally flip your drill into reverse.  I unscrewed one segment of the LintEater inside the vent when I flipped the direction without noticing.  Luckily it was just inside where I could still reach it with my hand.  This warning is in the instructions, but its worth repeating.