Product review (5 stars): This really worked well even taking shortcuts
We have 24 foot of solid dryer vent pipe ending in 3 right-angles before going through the floor into the flexible dryer-vent hose coming from the dryer.  I can't get behind the dryer without moving both the washer and dryer and they are HEAVY.  So being lazy I decided to clean the vent from the outside of the house inward.  I didn't use a vacuum cleaner or a blower or suction of any kind.  I did tighten each section of tubing with pliers and taped them.  I threaded all 24 foot of tubing with the brush on the end into the outside vent and then backed it out.  I got a good amount of lint clods out.  Then I turned on the dryer to blow everything out.  I got no air coming out at all.  My fear had come true, I had forced gobs of lint into the right-angles at the end of the run.  I still didn't want to move that washer and dryer so I figured I'd try one other thing, use the clodbuster attachment.  Now I'm really getting lazy so I tightened each tubing section by hand (no pliers) and didn't use tape.  I pushed all 24 foot of tubing into the vent until I hit some resistance and then turned the tubing by hand (too lazy to hook the drill up).  Then I pulled it all out and there wasn't any lint at all that came out. So now I'm resigned to having to move the washer and dryer, but before I do I figured I might as well turn the dryer on and see what happens.  Lots of lint clods blew out and kept coming out for about 20 seconds.  I've attached pictures of it.  I'm really happy with this product and if it worked for me with all the shortcuts I took it will probably work great for you.  As a point of reference we built this house five years ago and this is the first time I ever cleaned the vent.  A load of ten bath towels used to take 45 minutes to dry, lately it's been taking 3 to 4 hours, so I knew I couldn't put cleaning the pipe off any longer.