I have been playing around with this for a few months now - it is pretty nice - not a lot of features yet, and will *probably* never really catch on in the "real" world of music biz - but still the same it is nice.
Some very great work has gone into it. It has been pretty stable for me too.
There for a while, they had some kind of partnership going with SSL that showed some promise. I think that relationship has since dissolved. It is a pretty cool piece of software though!