> If we tried to accomplish the first goal (Bring version control into the development process for those who don’t use it.) with Git or Mercurial, most people would have been lost. With the lack of any decent GUI clients, a difficult mental model, and a less proven (read: newer) system this would have been near impossible.

According to github.com/home:

> Join 224,000 coders with over 733,000 repositories

Also, in a recent blog post, they said they're clocking about 109k commits per day.

I'm not sure where beanstalk is there, but that's a few times larger than google code (which also bet on subversion).