Product review (5 stars): Worked fantastic.
Worked fantastic.  I was shocked at how much lint was stuck in the vent tube.  My vent tube is 4 inch sheet metal and not the bendy kind.  Before cleaning, an appliance repair guy measure the exhaust speed at 900 FPM.  After cleaning it is 1350 FPM.  Unknown how durable the LintEater product is, but since you only use it occasionally I imagine it will last a while.  The shop-vac attachment really helped with the clean up.  I'll be adding this to my regular to-do list going forward.