I have to say that I haven't had the time to dig into it; but simply taking a folder full of audio files such as licks, effects, or drum loops, and dragging+dropping them to make an exs Instrument takes about a minute; doing it via the exs Editor is quite a bit slower.
I actually like to set up exs Instruments for all my Apple Loops. That way I can audition them "by hand", trying out various combinations, etc, which is often more comfortable than using the rather cumbersome Loop Browser.
Keymap is deeeeep.....I'm looking forward to exploring it but the next deadline is creeping nearer ;-)
PS (Jay-this one's for you hehe)