Product review (5 stars): Awesome - a small investment that will save you hundreds per year in maintenance costs.
This little tool kit changed my life.  No more dropping $100 every 4-6 months to have a professional come and clean my dryer vent.  It is fairly easy to use (a little awkward, but much easier if you are using a shop vac to suck out the lint as you clean.  My dryer was like new after I finished cleaning it out with this kit.