Product review (5 stars): If your dryer works and your clothes are still damp, then get this.
So after having to deal with a dryer that took 3+ times to run to dry a load of clothes I thought, "What the hell. I'll only be out 20$ if this thing doesn't work worth a damn." I started working my way up from the vent pipe where the dryer attached and ended up using all six sections to get halfway up the vent then worked my way down from the attic. After that I finished up by running it once more up half way to pull any left over bits of dryer lint out and for good measure I ran it through the vent into the inside of the dryer itself.  I then hooked it up as normal and ran a fresh out of the washer load and holy crap. It was completely dry in one run including the towels that go wrapped up in the fitted sheet that was in the load. So I will finish up by saying you bet your ass this thing is totally worth what it costs. It is going to save me a lot just in the electric bill.