I've tested it, not impressed. Tries too hard (including the ultra minimalistic design).
I don't think it will ever go mainstream, but time will tell.
And yes, as fetishwealth said, they took VC money.
I never did and never will understand what's wrong with a company wanting to make money for its stakeholders while providing value (multiple FREE services) to its users. Then again, I'm not too much into this neo-hippie entitled 'free-for-all' BS and choose to live in reality instead. ;)