CARP?

I'm looking into using CARP to build a pair of redundant firewall / 
routers within my organization.  I've read the paper 
(http://www.netbsd.org/guide/en/chap-carp.html), but would like to know 
if any of you have had any experience (good or bad) with it.  This is 
something that will eventually go into production, so I need to know 
what I'm getting myself into.

Thanks everyone,

Michael