Product review (5 stars): Scary/Amazing what you can get out of your dryer vent with this thing
Our dryer kept taking longer and longer to do its job (sometimes taking three or four cycles to get everything dry) and we were afraid that we'd have to invest in a new one soon. Then somebody asked me if we had ever cleaned our dryer vent. We never had. Some more online research led me to this product and I figured less than $30 vs. a new dryer for I don't know how much more was worth a shot.

I followed the instructions and secured the rod connections with electrical tape. Also made sure the drill was set to the right torque and clockwise spin only. With just the first rod segment I removed a shopping bag full of lint from the vent. I continued from the inside of the house to the full extent of the four rods and then came in from the other side on the roof. This should pretty much cover the entire length of our vent. With the amount of lint I got out we could have probably made clothes for our family for the rest of this decade. It was a miracle that air still flowed in that vent and that nothing ever caught fire. Wow! I used the other brush and the vacuum adapters to clean out the dryer itself and suck out whatever was still floating in the vent.
Then the first test with a full load of laundry... It was dry in just one run, actually even before the timer rang. I was impatient and checked.
I expect to see this reflected in our gas bill and the purchase should amortize in no time. Needless to say I am now bummed that I waited this long. Will definitely use the lint eater on a regular basis now and can wholeheartedly recommend it.