Product review (5 stars): Excellent product and showed me that my vent obviously needed a cleaning
Anyone who thinks they don't have a problem with lint should look at these pictures.  My house is only 10 years old and this is what came out of our vent.  That doesn't even include what was cleaned out from our dryer filter and what was in just the dryer unit.  This product is very easy to use.  I definitely suggest taping each junction to make sure they don't separate in the vent.  I broke my cleaning into 4 cleanings. Fist cleaning was with just the brush and the first extension.  After ensuring that section is clean I added the second and so forth until the brush came out clean.  Given the length of the brush with all four sections, I found it easier to have another set of hands guide the brush into the vent while the other set was operating the drill.
I noticed that when I turned the dryer back on there was some lint that was dislodged and blew out the outside vent opening.  Unfortunately in my case some lodged between the slats and is keeping the vent opening from fully closing.  I will be making a trip up my ladder once the ground dries a little so I can remove those pieces.  A little price to pay for a clean vent.