Doesn't seem to be anything new technology-wise. The difference is the platform, when it's browser based any computer can use the software. But to be honest I don't see it beating Rhino (which is what I'm using).
Browser-based programs have big downsides. And the whole cloud idea is terrible to me, as for 50% of the time I'm not connected to the web.
http://www.marinusdebeer.nl/
