I haven't dived into the details of Evil mode too much. The basic Vim motions and commands work out of the box, so for a casual vim user, it ought to be enough. I also went ahead and installed Evil-leader, so I could have the same <leader> keymaps that I have in my vim config.
A few places where I looked for small things here and there:
PS: Some of the configuration needs to be set up before you activate certain modes - which is often implicit in plugins, so watch out for that. Eg: To emulate C-u behavior, the functions had to be put ahead of the (require 'evil) call in evil-leader.el