I used to have the Decimator 1, and never bonded with it. I thought it was a step up from the Boss NS-2, but nothing special. It wasn't choppy enough for my taste. I don't do much weedly weedly, so I don't really care about how noise gates handle like bends higher up the fretboard (I can always turn the gate off if I want to), but for choppy rhytm stuff, I found it wasn't fast enough. Not only that, but to kill all the feedback standing in front of a cranked tube amp, it had to be set pretty high in the threshold knob to the point where it started messing with what's actually being played through it. Nor was it fully transparent as many people claim. It didn't mess with the tone a lot, but there definitely was a change.
I then got an EHX Silencer, and it was absolute crap. Super slow, left a trail of noise before it shut, and even when it did, there was a little hiss left.
I then got the TC Sentry and I was much happier with it. It's a lot more tweakable, it can be set faster an choppier, and I find it messes with the tone less.