I've evaluated the beta last month and it is a really interesting technology. Especially now it has incremental state transfer, which allows nodes to catch up again (e.g. after a reboot). It has some rough edges, but the developers are really helpful and on top of things.

How different is it from using a single mysql-server, is it entirely feature compatible?

Anyone know how it compares to Postgresql XC? http://postgres-xc.sourceforge.net/