Just wanted to say that. I hesitated for months before switching to zsh but here's a short presentation that sold me: http://www.slideshare.net/jaguardesignstudio/why-zsh-is-cool...

Speaking of git completion and branch info on the prompt, there are plugins in zsh for this and they're very easy to customize thanks to well-established conventions in oh-my-zsh.

It took me couple of hours to migrate from bash but it was time well spent.