Product review (5 stars): Great Product
I had been having problems with my dryer for the past couple of weeks.  It all began with a piece of bad ducting put in but the home builders that acted like the perfect lint trap behind the dryer.  Well, eventually the lint buildup was enough to take the ducting apart and I looked behind the dryer only to find a giant clog and lint all over the floor and wall.  Well, I cleaned everything out that I could inside and outside and it still took forever to dry.

I read a bunch of "How To's" on what might be wrong so I measured all the resistances on the heating element, thermal cutoffs, etc and they all read to spec.  So I figured it might be the ducting still, I have two 90 in my ducting so I figured it was caught in one of those and pretty plugged up to not be working.  So rather than root around in my attic and try and find where they buried the ducting in the insulation I decided to buy this thing off of here.  It's about $10-15 cheaper on amazon than hardware stores or home improvement stores.

I was kind of skeptical, but figured what the hell.  I was pleasantly surprised, the auger brush hooked easily into my cordless drill and fed itself through the ducting.  I bought the extensions because my ducting goes 27'.  But it cleaned it out very well and is very easy to use.  It even bent easily around the 90 I thought was plugged.  The pile of lint that came out would help explain why my dryer is now shot.  No airflow equals a no-no for dryers...they need it for internal cooling...and gas removal for gas dryers (CO).  But at least now I have this so I can clean my ducting out once in a while to keep the new dryer from burning up.  It was an old dryer anyways so it was about time to replace it and the washer which is also having issues.  But I definitely recommend this to anyone.

One thing you can check to see if it the ducting rather than the dryer too is let your dryer run disconnected from the vent.  won't actually hurt anything for one load.