I second this. Although I myself use Emacs and am very happy with it, Cursive allows focusing on Clojure and not on the setup. Though once some level of skill has been achieved, I'd recommend Emacs. :)
Why though?
Cursive has a working debugger while Emacs doesn't.
Emacs has a lot of stuff outside the realm of Clojure, like irc mail and orgmode, but Cursive really is the more advanced Clojure environment.
Even @dnolen seems to have switched to it.
Maybe it's just my 4gigs of RAM speaking, but Cursive is sluggish and heavy. I have Emacs running in a drop down terminal, that I can hide and show fast, I can run many languages simultaneously (Python and Clojure for me), I can quickly navigate and to all sorts of things without any load time. Everything feels very effortless, thus why I'd recommend Emacs. Not to say that I am above opening up Cursive for serious refactoring or navigation. :)