On one hand the interface is interesting and novel, but I'm not sure it really has a lot to offer initially. It's much easier to visualize the relationships between pieces of data with how the linking works, but the individual dots are spread enough that it doesn't provide quite the context that it has the potential to provide.

I'm impressed that it works in Chrome on Linux with no additional plugins or craziness. Their interface is clumsy though, and could learn a lot about user interaction in 3d space from video games.