Product review (5 stars): Works amazingly well
My wife and I bought a 15 year old home and soon found out the previous owners did not maintain or clean the dryer vents.  We bought a brand new fancy high-efficiency washer/dryer set and noticed our clothes were taking a very long time to dry.  I got a quote from a technician to clean the vents for over $100.  So I decided to do some research and found this kit on Amazon.

In short, this kit works amazingly well.  I'd highly recommend using a shop vac with this but if you don't have one, they do have an adapter so you can just use your running dryer to push out the loosened lint.  I was shocked at how much lint was stuck in the vents.  The loosened lint overflowed the shop vac and I had to clear it out half way through my cleaning!

As other users have mentioned, read and follow the instructions and this thing will do what it is advertised to do.  The whole process from beginning-to-end took about 1 hour and 10 min.  This included running the cleaning kit from both inside the laundry room and outside through the vent hole on the side of the house.

Took about an hour, saved me a ton of money, and I can re-use this thing every 1-2 years to keep the vents clean.

Highly recommended!