Product review (5 stars): Easy to Use and It Works
I have not tried any other dryer vent cleaning systems, so I cannot compare products. I can only give you my impression of using this system on my dryer vent that has a 90 dg bend at the bottom and about a 15ft vertical vent pipe. Overall I would rate this product as excellent and recommend it.

I admit I was initially confused when I pulled all of the pieces out, but it became quite clear how to use everything as I started to use it. I did not need to view the DVD, and only briefly looked at the instructions. I hope these tips help if you are looking at this product or have used it:
1) The 4" auger brush for the vent pipe fit snugly into the opening and I got the hang of how to rotate it and move it in and out by hand. I did NOT use the drill, I just rotated the attached poles with my fingers/hands. It was very easy to do and I felt like I had better control than using a drill.
2) I had my leaf blower attached to the bottom of the vent blowing up (using the attachment provided and duct tape). This worked great, however be sure to where a mask and safety goggles when feeding the brush from the top. There was a lot of debris flying up in my face!
3) I could not reach all the way down to the bottom even with all of the poles together, so I used the other attachment with my leaf blower to feed the auger in from the bottom along with the air blower. This is where the 90dg angle is in my vent, and I had no trouble at all getting around that bend. With a sharp turn like this, I highly recommend NOT using a drill and feeding it by hand since you can get a much better feel for how it is feeding in and what type of stress is being introduced on the flexible poles.

It took me about an hour to setup, clean out the vent, and then cleanup everything afterward. The tools in this kit make it a very easy job that anyone can do, and more importantly it does a great job removing all of the lint from the vent.