Which version to upgrade to for Bugzilla's MySQL server?

[Eddie Xie]

My Bugzilla is using an old version of MySQL ("Ver 3.23.51 for
pc-linux-gnu on i686"), so I am going to upgrade it.

I see that MySQL 5.0 has been out for a few months now.  What are
people's experiences with it?  Has it been field tested enough to be
found reliable for use?  Or should I go instead to the last release of
in the MySQL 4 line?

Thanks!

-- 
Eddie Xie