The ISP Decimator only made my rig Tri/2:90 rig worse. It can make your rig scary quiet, buttttttt..........setting it up so notes don't decay, or if you want feedback, or when you want clean sounds like chords to naturally decay the decimator sucks for. PLUS, and this is HUGE to me, the unit actually adds more noise into the rig..........so when you roll your volume down on your guitar and want to play cleaner parts, you can really hear the horrible noise it added. The new ones come with a ground switch, so I never got to try that seeing as I have an older one. I should also say the other guitar player in my band tried using it on his new Marshall JVM and it bothered him too...Added more noise underneath, and was impossible to get the right blend of gating and letting notes trail off.
My DBX Compressor/Limiter/Gate ended up working perfectly and is gating my Triaxis in the effects loop, and Marshall JCM 2000 in the effects loop.