[D9u]

You can easily drop your existing BASH aliases, etc, into .zshrc and not even notice that you've switched to zsh.

As for "Oh My Zsh," I've never seen any reason to use it, as zsh works fine without any add-ons.

[pyre]

  | As for "Oh My Zsh," I've never seen any reason
  | to use it, as zsh works fine without any add-ons.

I'll second this. I've never found a need to use "Oh My Zsh," and I've been using zsh for a few years.