Product review (5 stars): Great product with everything you need (except the drill and ShopVac)
Along with the 12' extension kit, this did a great job cleaning our 30-foot dryer vent after 7 years of heavy use by a large family.  The instructions are clear and the components are good quality.  I cleaned from the inside laundry room going out the vent using the handy ShopVac attachment in very little time.  My wife was impressed by the amount of lint it cleared.  With 24', it didn't quite reach all the way outside, so I also cleaned the last few feet from outside going in towards the dryer.  I was very pleased with the product and plan to use it every year or so.  It's easy and much more economical than hiring someone.