Product review (4 stars): It does work!
Would have given 5 stars if i hadn't had to tape the rods together.
I hadn't cleaned dryer vent in almost 15 years - needless to say, it was pretty full.
Hooked system up to my cordless drill, started inserting brush/rods from dryer end and ran it back and forth a couple of times before pulling it out. i held a wastebasket under the  vent when I pulled the last rod out and it filled it up! Then hooked my shop vac up to the vent to blow out the rest. Went outside and inserted brush/rods from that end with Vac blowing through duct. Amazed at the amount of lint that ended up on the ground. Overall, the job took about 30 mins, including moving dryer, disconnecting/reconnecting vent. Considering that a local company wanted $120 to clean one time, I'm very happy. I'll be using this device on a yearly basis from now on.