Christopher told me that while the beer gun is very easy to use, and looks very cool, it can be a pain to clean all the parts.
As an aside, it takes a bit of getting used to the device I made. Jamey dropped by before I went on vacation last week to pick up my entries for the fair (thanks Jamey!), and he observed my using the device. He can add his own observations, but at one point I over filled and the pressure drop when I removed the device from the bottle resulted in a fine spray of beer all over my arms. Jamey's response "At least you did not hit the ceiling . . . that would be hard to clean."