I can't speak for the gas rammed Gamos being offered by Pyramyd, but I converted a CFX with a Theoben ram a little over a year ago. The progression went from stock, to CDT tune, to gas ram. Although I don't have it anymore (at the moment, that may change soon), that gun is still going strong, and is a very consistent 15 fpe rifle. Don't know for sure, but it's got to have well over 5K pellets through it after the ram install, and with the right shooter, it'll stack pellets at 20 yards off the bench. BTW, this gun killed 2 springs before it had 4K pellets through it. And no, it wasn't dry fired, nor was it fed a lot of heavy pellets. If I was still a springer guy, I'd do it again, no question. The whole character of the rifle changed, all for the better. But again, that's with a Theoben ram, I really don't know how the Air Venturi ram compares. If anyone's interested, I do have several pages of chrony data for it, might be an interesting comparison. Bottom line, I don't think you'd regret the gas ram. HTH.
Dave