Product review (4 stars): Worked well - A non-handyman's review
We were the first owners of the house and had never cleaned the vent in 7 years. We were buying a new dryer so I thought I'd give this a shot since I was going to detach the dryer anyways.

I tried to use my new Bosch cordless drill but the chuck was too small and no adapter was included. My old craftsman drill fit but the battery didn't last long. I figured it was cheaper to buy a corded drill instead since I didn't own one.

There is a reason they recommend cordless drill. The process is very easy and safe with a cordless drill. However, the torque applied by the corded drill caused the cable to whip round and round since the trigger wasn't very sensitive (I got the best drill I could find for ~60$). This caused the metal end of the cable to break and smack me on the arm missing my eye. Did I mention I'm not even close to being handyman?

So here are the steps (follow at your own risk) :

1) You should wear eye protection and mask before you begin. Remove the flap or whichever type of vent cover you have outside. Detach the aluminium tube connecting the dryer to the vent duct at the dryer end. Attached the shop vac attachment to the vacuum and attach it to the tube in the house. Make sure the vac is set to blow the air outside. Turn your vacuum on and go outside to check whether the air is blowing in the right direction. Attach the vent brush (not the lint trap brush) at the end of one rod and make sure you screw in the tiny screw in to the brush. Connect the other end of the brush to the drill and ALWAYS make sure the drill is rotating clockwise even when pulling the rod out. Insert the rod in to the vent outlet outside the house. Once the rod is 2/3 way in attach another one. Repeat for each rod segment. When done pull the rod out and dissemble each section.

2) Turn off and detach the shop vac from inside of the house and move it near the vent outlet outside. Vacuum the lint pieces that were blown out from the vent.

3) Connect the shop vac with the included adapter to the outside vent outlet. Change the setting to suck the air in. Turn the vac on. Repeat the steps mentioned in step one the only change being that you will be inserting the rod in to the vent duct from inside the house.

4) I didn't need to clean the lint trap using the included brush but you may want to.

The amount of lint removed was substantial and the drying time was cut in half. Mission accomplished.

I took 1 star away since the rod doesn't fit smaller chucks and they don't include an adapter with it.