Product review (5 stars): Worked as advertised
This worked very well; as advertised.  I have a 45 dg turn about a foot out of the dryer, then another 45 after 12 ft of duct, just before the exit grate.  Fortunately I am able to enter the the brush through both the dryer side and the exit side.  The vacuum connection to the collar is very helpful.  I think this is a well thought-out and constructed product and worked very well for me.  I did not do the tape on the joints as I could not see how the couplers could possibly come undone, providing one does not run the drill inreverse.  This proved to be true and it was a simple process.