This has been near the top of my want list for the past 6 months or so. The only thing stopping me from getting it now is the fact that I've been buying more gadgets than I have time for lately. Limiting myself to professional necessities only for now (until the stress becomes too much anyway).
From what I know of them, the only possible downsides are the lack of midi (which I don't mind) and a rather user-unfriendly interface. But as an instrument it looks truly amazing. Watched it demoed awhile back but haven't got my hands on one yet.