The only bad thing about it is emacs is so shit-ass slow at rendering text that I have to drop back to a normal shell for commands that spew a bunch of shit (like maven, ugh).
It's one of the can't-live-without-it things that's keeping me on emacs.
(Also how dumb is it that a text editor is slow at rendering text? Emacs is amazingly flexible, but the implementation is just junk. I dream of an editor w/ the speed & implementation quality of Sublime, with the flexability of emacs, that'll still run in a terminal. And a pony. I want that too.)