We were thinking about it. I fired up our apps testsuite and found a bug: https://mariadb.atlassian.net/browse/MDEV-4711

The bug was now been analyzed but not fixed for ~3 releases.

That said I also ran the testsuite against 5.6 and found some problems, too. You might also be concerned about http://bugs.mysql.com/bug.php?id=69274 - this means that if you loose an idb file during a crash you're out of luck to use your db ever again.

We're thus currently stuck at percona server 5.5 with regular investigation of the alternatives.