Product review (4 stars): Works as I hoped it would
I had a very plugged dryer vent and was able to use this tool to clean it so it looks like new. The only limitation for me was that the dryer line run was longer than provided extensions.  But, my dryer hose length is likely longer than most and I was able to still get a full cleaning by first going from inside to out then outside to in.  This was probably easier anyway because I think a really long set of extensions would be difficult to handle.