FWIW, I have an SWR Octane 9. I use it on an M&P9 handgun, and on a SBR 9mm AR. The barrel on the AR is a TROS 5" with three lug mount. So far I really like this can on both the handgun and the AR, but to be honest I can't really compare certain things such as the sound reduction to other choices. The weight is light enough that it's not very noticeable at all on the handgun, or the AR for that matter. It seems plenty quiet on both. I love shooting my 9mm AR with the Octane on it and subsonic ammo...so much fun. My only complaint (if you want to call it that) is that it sometimes isn't all that easy to take apart and clean. BUT, I have the 'old' baffle stack.
The current baffle stack is supposed to be lighter and quieter, but it also looks *much* easier to take apart and clean. I'm getting ready to send mine in to be upgraded to the 'new' baffle stack. I wouldn't buy anything that isn't designed to be easily pulled apart and cleaned by the end user. If you think you'll shoot cast bullets through it (not jacketed or plated) then cleaning will be a necessity at some point to maintain performance of the can. In fact, other than special requirements (like a large volume can for use on an SMG) I think ease of dis-assembly and cleaning would be my top priority.
It helps if you clean after every use because in my experience the buildup can harden over time making it more difficult to dis-assemble. But if I don't really shoot much through it, like 50 rds, I don't clean usually. I haven't really developed a good sense of this yet though because most of my suppressor use in the past has been with sealed rifle cans.