Product review (5 stars): Works Great!
There are a couple of different lint brushes on the market.  I have used the hand brushes, but will not recommend that again after using this one.  One reviewer noted that the bristles provide an auger motion that helps the brush self-feed through the ducts.  That is a huge benefit.  You can let the brush do the work and by adjusting the speed on the drill, the brush will self-feed at a nice slow pace.  A set screw for the brush is provided, this really helps keep the brush in place (make sure you use it). Also, the vacuum attachments, while not necessary, help with cleaning.  This kit cost more than others, but I highly recommend that you pay the extra money.