Was mining there for awhile, but after the recently incident, it seems like they might take forever to recover.
Their interface is great, and to offer paid stale share makes it a better value to mine there.
They said on Oct 28 that they will come back in next few weeks.
https://bitcointalk.org/index.php?topic=54673.msg3428112#msg3428112But no knows? They were hacked and the vulnerability can not be identified, they lost 1170 BTC, and the users' account balance are all lost.