I bought the Decimator pedal yesterday to stick in my effects loop to quiet down the typical premap noise. I have a Boss GT-8 (the Decimator comes last in the chain - after the GT-8 of course) and the GT-8's noise reduction is fairly decent but I have noticed a definite tone impact in the high frequencies when setting the threshold at my required levels. Now, with the GT-8's noise reduction even when fully gated there was a light high frequency hum that was still noticeable to be irritating though not too loud. So, disenchanted with the possibility of using the GT-8's reduction I went out and bought the Decimator on so many recommendations. First thing I'll note about the pedal is how much it weighs. This thing is the heaviest Boss styled pedal I've ever came across. It feels like you're holding a solid brick. It's chrome which looks really hot and is made of sturdy metal. I wonder if it's the pedal construction that makes it heavy or a bunch of tightly crammed in circuitry? I'm curious. Anyhow, I set it up through the effects loop and started raising the threshold until the sound went quiet. I gave it just a slight tad of extra threshold just to be on the safe side. When I started playing I was suddendly appauled. It was pumping and breathing the sound like crazy and the volume of my guitar was cut in half. So I was nervous. So I backed of on the threshold till it was at the point where it was quiet when not playing, like you're normally supposed to set it, and bingo everthing was fine. No pumping, back to normal volume, and dead quiet when not playing. This thing even took away that small hum that was still present with the GT-8. The only way you can tell audibly that the amp is on is to go up to the speaker to hear the light ambient "air" that all speakers have when the amp is on. I started contemplating whether it's worth the $130 (120 plus tax) to use this pedal rather than the GT-8 and I came to the conclusion of yes it is. I have to say that I don't feel they really should be charging $120 for these pedals. I think they should be more around $80 - I hope this comment doesn't draw flaming The thing that irks me most about the pedal is that the threshold difference can be sooo slight and make such a huge difference between noise reduction and completely cutting off the signal entirely!! I wish there was a lock for the adjustment knob caused I'd be scared about accidentally hitting it with my foot live on stage and turning off my sound. If I were to be using it live I would have it out of the way where it couldn't be touched. Also, they state on their website how fast it reacts but I have to disagree. It's reacts quick but don't expect "Chug chug chug -stop- chug chug chug -stop- with immediate dead silence in the stop areas cause you'll hear the noise quickly fade out as it clamps down on it. The rack version is probably much more effecient and handles this? but at $400 I'll pass for now. So, overall it's a great pedal that gets rid of your amp and effect noise and does so completely (at least for me it does). It's true that it DOES NOT effect your tone - at least not in any way that I can hear and I have acute hearing. It's built extremely solid and rugged feeling, looks great, and is IMO a bit pricey. It is however very sensitive with threshold adjustment and the slightest bit of knob movement can mean the difference between it doing it's job and utterly fucking up your sound so make sure to put it out of the way after getting it set. And while it does an excellent job of avoiding cutting off sustained notes it also doesn't clamp down as fast as it's advertised though it's certainly quick enough that if it's still not good enough for you than see if that rack version does the trick. Rev.