Product review (5 stars): a very good system
It's a well put together kit, with all the parts you need and clear instructions.  The DVD is quite helpful, and all you really need to do is to watch it.  I had a buddy helping me, which is not necessary but I recommend it.  Together it took us about 40 minutes, which included about 15 minutes of trying to get the @%@#*$% hose back on the dryer.

This system really does work.  The amount of time it takes to dry my clothes has dropped remarkably, 10 to 15 minutes less per load.  Even at 10 to 15 minutes less per load, the stuff comes out bone dry.  The kit is totally reuseable, so the owner can box it back up and haul it out again in a year.  A handyman would charge (in my area) $100 to $125 to clean the dryer hose, so this is a great deal.

I did find, though, that my wimpy 12 volt drill did not have enough umph to really spin the brush.  My 19.2 volt drill, though, did the trick no problem.  A stout corded drill would probably be up to the task as well.  I also found that I did a good bit of cleaning up inside the dryer itself.  Lots of lint stuck up in there.  Don't neglect that part of the job.

This is a good system and I highly recommend it.