Product review (5 stars): Use it with a Drill...Heres why
First, you Need to know that it works and you have to get one!  Our home was built in 2003 and we purchased it from the original owner in 2016. We purchased a brand new washer and dryer after moving in. Our dryer almost immediately began giving us an Air Flow warning and we were hoping it wasn't the dryer since it was brand new. Our dryer also had a automatic shut off when it sensed the clothes were dry and it would often think they were dry but they werent. We decided to give this a try and almost gave up because it kept getting stuck in the S curve in the pipe  Turns out it was clogged in the S curve and when we pulled it out it kept bringing small clumps of funk back out with it. It took about 10 times of us pulling it in/out before it made it to the outside of our house. (We tried to use this without a drill at first but if you have a clog then it will give it power to break through it) Definitely worth the $17 for our clothes to dry faster, our dryer to work correctly, and peace of mind that our house won't catch on fire! Also, the picture I included only shows half of the funk it pulled out. Most of it went into our grass and is almost impossible to get out of the grass...would recommend cutting the grass really short around the vent or putting a box underneath before using.