Yep, he started the craze of these things.
Also I think that with DSO he may have not used the cabnetulator output, I notice his tone had more treble and even with the treble full on and bass off I can't get that tone. but with just the speaker output I can get it. The cabnetulator adds more fatness though, and makes the highs less harsh. Which is definitely the tone from furthur we hear.
Mine was just fixed and is for sale to anyone, 250$ + shipping and it's yours. It is a little more then others because it was just recapped and has fresh tubes in it. Or if you happen to have a a groove tubes trio I could trade this onto of some money!