Product review (5 stars): It works!
I am fully satisfied with this kit.  I had two runs of about 40 feet so I purchased the extension kit.  I could not believe how much lint had built up in the last 8 years!.  I filled up my shop vac cleaning the two vent runs.  Most of my runs are solid PVC pipe which I thought would not collect lint, but I was wrong.  The manufacturer suggest cleaning your vents 3-4 times per year.  I think this is excessive but plan to do mine once a year based on what I collected.