I've been working heavily with 2.0 for a couple of months now and it is a huge improvement over 1.x. I've converted 90% of a $20 template that I bought over to it and it cut out a ton of bad css (you get what you pay for I guess).

It is still a bit in flux (ie: they just renamed a bunch of css for alerts and tables), but if you don't mind tracking the progress (made easy with your own git branch), it is a great basis to start a website from.