I've seen a few of the "excel crowd" comments so far. Could you imagine the performance of this system if they really let a few of the "excel people" make their own charts and graphs like are in that video? It would destroy the system in short order, I'm guessing.
It could be useable, I don't want to dismiss it entirely without even trying it, but honestly the website's text has really turned me off, so I probably won't.