I've got the Gemtech Outback II. I once attended a panel lecture with Phil Dater. His response to the disassembly craze amongst .22 cans was "How often do you disassemble and clean your muffler".

I don't know where I am at on that approach. My Outback does seem as quiet as the day I bought it. It also seems heavier. But not much.

If you have a host you are thinking of trying it out on, you live close enough to me that I am sure we could arrange a chance for you to try it out and see if it is to your liking.