Unbelievable!!!! I have tried virtually every high gain distortion pedal on the market and this one is by far the best. Why? Because it is completely silent, even at the highest gain settings. You can get a slight rock distortion all the way to full blown metal. With an equalizer scooping the mids, death metal is achievable, but you may not know it since the typical noise is not present. I have tried the following high gain pedals: Tonebone Hot British, Digitech Metal Master, DOD Death Metal, Zoom Tri-Metal, Zoom Hyper-lead, Rocktron Rampage, Danelectro Fab Tone, Art Xtreme, Art Xtreme +, stock Boss Metal Zone, H&K Warp Factor, Digitech Hot Rod. None of these have the range (light distortion to balls out metal) that the Keeley has and with no noise. I can even run this pedal with another high gain distortion pedal without added noise!! Unbelievable. You have to get this.
[Kevin on Harmony Central]

I just cracked open the box an hour ago and am covered in sweat...WOW...The sustain is incredible and the notes that you play just jump right out..I'm playing a Jackson DK2 with stock pick ups through a Marshall Mode Four with a 1960B cab.Electro-harmonix small stone. It all sounded ok and just that. The twilight zone mod has made a HUGE difference. It's like i put in new pick ups like emg's or something because you can get that master of puppets tone..There's no noise with this pedal.
[M.T. on Harmony Central]

This thing is CRUSHING. I have a stock MT-2, I just bought a new one Modded from Keeley. Amazing improvement. The core sound is nearly the same but it sounds more rich, with more body. Definitely the best metal stomp-box distortion I have heard. Low noise, very powerful.
Augustine on Harmony Central]