Depends on which mailing list you read, the usual consensus I see is it's kinda production ready, though openSUSE has switched to Btrfs as its main file system.
SUSE Linux Enterprise also uses btrfs by default. There's also a bunch of features like booting into snapshots and snapper (snapshots taken before zypper transactions and on regular intervals with decaying granularity) which are in both OpenSUSE and SLE.