We've launched a MPOS based Pool on the eth (not geth) c++ implementation of Ethereum with 1 % fee:
https://eth.maxminers.net
We should be safe against any flaws/errors in the Go-Client geth.
A few Blocks have been found already in our tests, payouts are working too every 60 seconds, so feel free to spread some hashing power over.
Of course the pool has all the MPOS features like Idle worker Notification, SSO etc.