I tried fish for a while, and it's really great. The out of the box experience is way better than zsh and bash.
But I switched to zsh, mostly because I couldn't get used to the different syntax.
I just tried fish, way too slow. I held down the backspace key, and instead of deleting 10 characters, the entire line was gone. zsh is also too slow. bash may not have the bells and whistles, but it's at least super fast and doesn't get in your way.