> Is there anything specifically about GitHub which puts you off, or is it just that BitBucket works so you don't want to change?

Github has a much worse record vs. Egor Homakov than Bitbucket :)

Also, Github is Git-only, while Bitbucket supports both Git and Mercurial. I use both, but prefer Mercurial myself, despite it being less popular.

I'll just volunteer that BitBucket has worked flawlessly for me for years. Of course I use repos others have setup in Github, but I've never seen any reason to switch.

> Is there anything specifically about GitHub which puts you off, or is it just that BitBucket works so you don't want to change?

The latter + all the hype surrounding the GitHub (thousands of 10-line "Ruby gems" and "JavaScript frameworks" don't help the browsability either). I generally dislike monopolies of ideas/implementations.