We are evaluating Percona Server 5.5 and results are interesting. I have upgraded one of our slave from MySQL 5.1.56 to Percona Server 5.5 . It was a drop-in replacement of data files and mysql_upgrade command. Every thing is running fine .
Is migration from Percona to MySQL is possible, if yes
what is the procedure to Roll back to MySQL 5.5 from Percona Server 5.5 ? (If in case we need to do that in future) .