Solaris 10 ZFS Postgresql request for comments

Hi all,
I'm querying for feedback/comments.  Wondering what the list thinks of
the following.

Assume this is to provide a production database for a small company or a
department.  Production hours 5am-9pm for the most part so night-time
downtime if/when necessary would not be a problem.

Platform:
  SUN ultra 20 or intel/amd based PC
  Hard drive1      = OS Solaris 10(+)
  Hard drives2 & 3 = ZFS mirrored pool with PostgreSQL intalled
  Hard drives4-N   = ZFS raided PGDATA


Would this be considered viable?
Has anyone implemented anything similar?
Any obvious pitfalls that anyone is aware of?


Thanks,
reid