geom_gate and geom_mirror status?

[Francisco Reyes]

Anyone has any experience with geom_gate, geom_mirror features in an ISP 
style setup?

At work we are testing them and so far it looks promissing, but we are 
wondering how it behaves under heavy load. Would like to
use it for replicating Maildir directories at an ISP in real time.

Originally we were looking for DRBD in FreeBSD (http://www.drbd.org) and 
searching for that we bumped into references to geom_gate/geom_mirror.