Spacemacs is absolutely amazing. I've done the rounds with emacs - trying it vanilla and rolling my own config, or using the various pre-made configuration packages (prelude, emacs-live, starter-kit, etc), sometimes with evil, sometimes without, and nothing has ever come close to what they've pulled off with spacemacs.
I switched to using Spacemacs from vim a couple months ago. I find it's a huge boost to my productivity; letting me use vim modes/hotkeys that I'm used to, and adding the handy features that emacs and plugins can provide.