Product review (5 stars): Simple and effective
Bottom line: this does what it says it will do and is decent quality.  If you're looking here you most likely have a kegerator and have experienced some foaming issues.  Cooling the tower is a great way to help that if the rest of your system is balanced (line length, PSI, temperature).

It comes with all required components and some easy to follow instructions.  You don't need to be mechanically inclined to install as it is super easy to install and hook up.  I was able to snake the power wire in the top next to the refrigeration line on my Sanyo BC-1206 after I moved some of the plumber's putty out of the way.  The only other thing is to run the hose up into the cooler.  It worked quickly and my tower went from being room temperature to cool and forming condensation very quickly.

Yes, you can build your own cheaper if you have an extra fan laying around.  I didn't, and didn't want to piece together something.  This fit my needs at a reasonable price.  Very happy with my purchase.