Product review (5 stars): Yes it works
Holy cow does this thing work well!  Did an outstanding job on our 28-ft dryer vent run (all metal ducting) and was quite impressed with how it worked.  It navigated through multiple turns fine.  It didn't make it through one last bend near our dryer but it was easy to come at it from the dryer end to get that last segment so the whole pipe is clean.  I needed to buy the extension rod set to double the length.  Our dryer is running noticeably better now.  It's easy enough to use that I will not hesitate to clean out our dryer vent on a regular basis now, probably every 6 months.