I own one of these (the elite version) and like it quite a lot. It's hard to comment on the sound since there are so many options for tubes and boards, but with the boards I've tried it is always very smooth and musical sounding. It's not the last word in extension and air, at least in my system, but I've been happy with it on the whole. The multiple tube boards can be good, given the flexibility it offers, but it can also be a bit frustrating: not only can you experiment with different tubes for a particular board, you can experiment with different boards, and so the sheer number of options available can leave one unsatisfied with what one has. I find myself always wondering whether a different combination of tubes and boards would give me a better sound.
Hockeyd52, why do you like the 12B4 board so much?
Hockeyd52, why do you like the 12B4 board so much?