Some of us do know the XFS guys are doing an excellent job tracking down regressions and bugs :-)
The only thing I never use XFS for is the root filesystem, and that's because nobody has seen fit to fix the XFS fsck to detect it is being run on a read-only filesystem, and to switch to xfs_repair on-the-fly.
It is no fun to need boot CDs to make sure everything is kosher in the root filesystem (or worse, to repair it)...
But it really works well for the MTA queues and squid spool, for example.