My GSblack arrived on Friday. #24 I believe of /30. First time I plugged it into my Lil Dawg D-lux I was blown away by how good it sounded. Incredibly thick with nice tight bass. The pedal has 2 switches on it: hard and soft and I and II. I = JTM 45 gain structure and II = JCM 800 gain structure. The JTM 45 sounds exactly like AC/DC in the early years. Lovely. I found myself digging the JCM 800 sound as this pedal is slated for that kind of sound on my board. Next I plugged it into my 59 Bassman. Not so good. I found some of the same issues with this combo that I found when I tried the GSBlue for a couple days. Very thin sounding with a fuzziness/harshness that was not real pleasing. None of the tone that I was experiencing with the Lil Dawg. Now, I couldnt turn up the bassman much becuase its such a damn loud amp. I know everyone always raves about the Jetters when they are used at gig levels and Brad himself has said that these are meant to run at gig volumes. So I wonder if thats a big reason why it doesnt sound right with the bassman but kicks ass on the Lil Dawg? Lil Dawg runs hotter at lower volumes. (6v6 in Lil dawg with 6L6 in bassman). I also may need to do some testing of the tubes on this but they should be good. Last test was gigging the pedal with my Budda Sd45. So gigged with the GSBlack and Budda last night. My goal is to have the GSblack supplant my Tone Bone classic from my pedalboard. I dig the Tonebone but dont like the size of it and the fact that it needs its own power adapter. (Even though its not a ToneBone hot British..I think its got a Marshall flavor to it. ) I wasnt able to play with both GSBlack and Tonebone going all night so I just did some tone tests during sound check and then put the black on the board for the night. Anyway, the GSBlk and Tonebone are both in the same gain realm. I think the TB can be a bit smoother sounding but it is NOT as articulate. The GSBlack had much more note definition within the cord..while still sounding full. The GSblack however was not able to feed back like the Tonebone...which was a bummer. Both had decent bottom end but the Tonebone may have had a touch more bottom..but not as tight as the GSblack. Overall the GSblack sounded a bit more "hi fi" for lack of a better word than the Tonebone. I think the TB has more flexibility with all its switches...but I preferred the black. The biggest thing I was happy about was that the GSBlk sounded good with my Budda. I was concerned after how it sounded with my Bassman. High marks for the Black. Its a keeper. I also have the Red and they work well together on my board. Red is a bit fuller sounding pedal with more mids. Just a sweeter sound. I wish I could get a Red with a bit more gain to it. That'd be really cool.