While I agree with people trying it, I also just want to give the other side. I tried it for a few weeks, and stopped. For some people it is perfect, but I found it didn't integrate well with anything else.

Like much of Emacs, it assumes you want to spend your whole life in org-mode. If that's not compatible with your life (and for me it's not. Sometimes I'm on another computer, sometimes an android device, sometimes in Eclipse), then org-mode will fight you constantly.