Product review (5 stars): Works Really Well
Got this a week ago and used it already.  This is a great lint removing device.  I have tried various "tools" that fit onto a vacuum cleaner, but I think these types of suction devices are pretty much a waste of money.  You really need to clean out the VENTS, not just the filter and dryer portions.  Also, I've found that none of the suction attachments really get any farther that the filter section in my dryer, and not into dryer portion of the vent.

I think other reviewers have adequately covered aspects such as closely following all the directions.  I would add that even with taping the connections, we had one connection come loose and was stuck in the dryer vent - I was using 5 rods, having bought an additional set of four.  Fortunately, I was able to reach the rod through the vent, but I was really sweating it; I'll use more tape next time.  One can clean either from outside the house in or from the inside (having disconnected the vent from the dryer).  We chose to go from the inside.  No lint is removed during the brushing out process, it's only "loosened".  Turning on the dryer will then blow the lint out, and in my case, a lot came out!  For our dryer (which is a stackable), the lint filter turns too sharply for the lint brush to make the turn; but I think by going in from the back of the dryer (rather than from the front), I was able to loosen most of the lint from within the dryer.  I believe the clothes are drying more quickly (fingers crossed).

I would recommend this to anyone.  It's exactly what I was looking for.