[exim] Dovecot IMAP - Opinions?

I've decided to (at least attempting to) convert from a patched version
of WU-IMAP to Dovecot. The reason I'm choosing Dovecot is because it's
easiest to convert what I have already to it. I may eventually convert
to Courier but Courier is poorly documented and it's just too big of a
step to go from what I have all the way to courier.

Dovecot supports MBOX and Maildir so I can (hopefully) make the
transition sticking with MBOX, then switch over to Maildir later. Once I
get that far then I might look at other IMAP servers that are even
better. I like it that Dovecot doesn't seem to be religious about the
MBOX vs. Maildir war and I wish Courier supported MBOX if for no other
reason than making the transision easier. In my case I'm stuck with MBOX
until I rewrite several other utilities that I currently rely upon.

So - my question. Is there anything scary or weird about Dovecot that I
should know about or any good resource pages that I should know about?