I was able to use my Blichmann Beergun for the first time this week and I was blown away with what an awesome product it is! It was incredibly easy to use and worked perfectly!
I have a counter pressure bottle filler that I stopped using because all it did was make a big mess, waste beer, turn everything to foam, and was way to difficult to use besides the fact that they are some what dangerous (not too difficult to blow a bottle up in your face). The beergun was light years ahead of a cpf. Once you get the beergun set up its as easy to fill a bottle of beer as it is to pour one from the tap.
To anyone considering a cpf I say dont waste your time, money, and beer, buy the beergun instead!