i had it on luxor several days ago but then they were having some display error so i switched to siamining - but it seemed luxor was producing more. i'm averaging 825gh/s on siamining and getting 51 sc per hour/ 1,457 sc for last 24 hr. what are you getting on luxor?
The display error was just with using the search function to view your account. I've been mining there for almost a week with no issues on that end (you can just paste your wallet onto the end of the url for the same result).
My only problem was a payment that didn't go through but that turned out to be solved by doing a recovery of the wallet (rescanning the blockchain). Luxor wasn't super helpful on the support end for that, but the coins weren't lost so I'm not complaining...