I heartily and vociferously recommend staying the hell away from Sirbet.
I had withdrawal problems early on when a CS person tried to contravene a clause DIRECTLY and explicitly written into a bonus I had received on a deposit...she screamed at me on the phone and refused to pay, all over $30. Corby called shortly thereafter, apologized and made good, but it should not require headaches and intervention by the manager just to get a lousy payout.
Thumbs down for that one.
Later, I had the infamous blackjack issue..made a ton in X hands, lost close to the same amount (after making a withdrawal) in a virtually equal number of hands. I emailed Corby directly -- as he invited me to contact him if there were any more problems after the withdrawal fiasco -- and asked him politely to assuage my worries about the casino being rigged. I got a terse form letter in response. I tried emailing him again, and again politely, and that time received nothing.
If that ain't enough to scare you away, you're far too forgiving of sinister books. Sirbet has seen my last penny, and I don't think they should see any of yours.