I use fish exclusively and swear by it. I switched to zsh some years ago and enabled fish emulation, but it was slower, and I realized all I was doing was using fish by proxy, so I switched back to fish.

It's fantastic, I urge everyone to give it a try. Pretty much the only valid complaint I see here is from people who have bash code that needs to be sourced to run. I definitely think that it's worth rewriting some code to switch to a much superior shell, though.