Product review (4 stars): It works.
This thing does what is says.  Sure, you could build your own and save yourself a few bucks.  But then how much is your time worth?  This comes complete and ready to use.  My only real problem with this is that the power cord is short and there is no way to easily extend it.  Putting this inside a Kegerator means that you need to either 1. Run the power wire up by the side of it and have the door close on it (possibly making the seal not perfect, but It seems to work fine in my case) or 2. If you have your CO2 bottle inside the kegerator, you can use the hole in the back to run the power through.  It is simply not possible to run an air line AND this power cable at the same time through the opening.

But in either solution, the power cable is too short and the on/off switch is by the wall wart transformer end of the cable which means you need to just leave it on.  While you would normally do this during operation of the unit anyway, it makes troubleshooting noises or re-configuring/moving things around less than ideal.  I am happy with the purchase and it does help.  I just wish there were more options regarding the power supply.