Product review (5 stars): GREAT PRODUCT, as long as you follow directions!
This thing is AMAZING!! Based on the reviews and my own experience, Here are my suggestions to make sure you get the most out of the LintEater:

01. READ THE INSTRUCTIONS!! It gives you some knowledge about your home vent system, and what to do / when to be gentle / etc.
02. PUT THE DRILL IN THE LOWEST TORQUE SETTING - if you hear the drill clicking and the brush stops spinning, it means you've hit a blockage - if you keep spinning it, the rods will break! When this happened to me a stopped the drill and started backing off a bit - a benefit of this is that when the fiberglass rods spin and then gets stuck the twisting gets it 'wound up" and it has energy like a loaded spring; by backing it out slowly, it started spinning again and chipping away at the blockage. I kept squeezing the drill trigger for a few seconds at a time, letting the brush work its way through the clog. Eventually, it will start spinning freely at the low torque setting - this means it's broken through the clog, let it spin there back and forth for 30 seconds so it can scrub the pipe clean, and then keep moving deeper.
03. ALWAYS RUN THE DRILL IN A CLOCKWISE ("Screwing In") POSITION - This will make sure that the brush and rod stays together in one piece. Spin it in the same clockwise direction as you put the brush in AND as you pull it out - as long as you do this, there is no risk that you will accidentally unscrew the brush and get it stuck.

The results are incredible - my machine is now running quieter and more efficiently, it's drying the clothes faster. That alone is worth the cost of the kit, never mind that I'll never have to pay for a professional cleaning again.

If you follow the instructions in the package, you won't be disappointed. Good luck!