Product review (4 stars): Half hour project saves you money the first time.
While a bit unwieldy, this little tool does the job.  Just make sure you put something in the vent door to keep the airway open if you are vacuuming instead of blowing.  I figured if I was in blow mode lint would be all over the back yard.  As it was everything stayed nice and tidy.  Having a shop vac is a must.