Isn't it really just fashionable at the moment? Saying 'it just works' is a bit like saying 'Hush Puppies will always be cool' in the 90s.
I'm already getting tired of bootstrap sites to be honest. I think it's going to end up backfiring on twitter in that their design will look very generic and boring because everyone's using bootstrap.
I tried to find a quick example with blank content, but this is the best I can pull at short notice: http://twitter.github.com/bootstrap/examples/hero.html
Question: Are you guys funded? Looking for funding? and do you store the data serverside in addition to the users device?