I haven't had much luck entering in the data I want to. I just can't seem to find the right spot and the labels for the sections use language that isn't intuitive to me. In fairness, though, I've only had about an hour, maybe two, to look at it. Even that was back with the first pre-release version. So, don't take what I say too seriously.
The thing is really, really nice looking, though. Even if I'm having data entry issues, the interface leads me to believe that it'll be much easier for a player to use than anything out there now -- by a long shot.
Since the developers are here, I've got a couple of specific questions for you guys: Is this going to support psionics/spell points? Obviously, it'll take some data entry on my part, but I'm curious whether it'll even be supported, since IMC every caster class has spell points instead of slots.
The other things I'm using in my game that I'd like to be able to implement are action points, class defense bonus, armor as DR, and the UA weapon group proficiencies. I've got all these figured out in PCGen, so it's definitely something I'm looking at in any new product.