Ah, so that's where Harry Kolbe's gotten off to...(he's a big name among the amp gurus and on the musician scene here in NYC - from looking at the reviews on his personal line of Soundsmith gear/mods on Harmony Central, though, one gets the impression he got so busy that his quality control and accounting suffered, though).
I'm really surprised a lot of amp companies, indie like these guys or otherwise, haven't done more stuff like this - the only other comparable product that I'm aware of is from Tech21, and that one's solid state. Guess they don't wanna cut into their sales of "real" amps........