First of all, it is mostly one guy, and he seems exceptionally bright, and a bit freaking insane (Tesla was crazy but still smart, so it can work). I exchanged a few emails with him that combined with lack of access to the source drove me away from the project.
That said, every single claim he made I found to be either valid or an undersell on the actual performance (it did even better than he claimed in my tests). I was rather blown away by the performance, but the risk profile on it just made it unacceptable. Code C-Script (it supports more now, I am aware, but at that point it was C), no source, [possibly] nutjob one man show, no ability to easily hire people to work on it (which to be fair is entirely chicken and egg).
But, it is still a project I watch with mild interest... and I do encourage people to try it (great comment on this thread how to run it as a user http://news.ycombinator.com/item?id=4110247) and try it out, if nothing else it is extremely opinionated software, and it really is borderline insanely fast.