Product review (5 stars): This is well worth the money!
I received this item in the mail yesterday and got right to work on my dryer.  The directions are easy to understand and I highly recommend giving them a good read for safety and tips to best clean your system.  Using this cleaner is fairly simple and requires mostly common sense.  Make sure you wear a mask and eye protection because you will be seeing plenty of dust and lint!

I'm going to take this to my parents house and clean out their ducts for them.