Just thought I would post some info as I recently bought a Sun Face with the high gain NKT's and it really is a wonderful fuzz. I love/loved the standard NKT's as they produced a warm, rich fuzz and clean up really fast. My only complaint was the inability to get longer sustain as I use single coils. So I ordered a version with the high gain NKT's and think this is now my #1 fuzz of choice...besides the DAM MKII. If the standard NKT went to 9 the high gain goes to 12-13. You can almost get into big muff sustain territory and it is amazingly quiet even when maxed with a standard Tele! I was shocked really at how quiet it is on both hiss and hum even when maxed on the fuzz. There is a bit more grit to the fuzz on less than max settings than the standard NKT and it does not clean up quite a totally as the standard version though it gets pretty close. There is also a lot more "useful" settings of the Fuzz knob...a wider range of tones too and it is still VERY responsive to guitar vol/tone changes. On the neck pu with the fuzz maxed and tone fully off I was into FRIPP territory and I got some really great Steve Hillage type lead tones as well. AC/DC classic rock tones at slighty lower settings with the bridge PU. The only down side, if there is one is the lack of 100% clean up until you turn the guitar volume down pretty far but you get VERY close to 100% clean pretty fast with just a hint of dirt. It also sounds great going into an OD that is responsive to guitar volume like my Blackstone. Between the two pedals I can get an amazing array of sounds. Really a wonderful fuzz all around!