I haven't played for cash yet, I'm still waiting and watching.
I tried the UB freerolls, but so far I haven't tried a real cash game, I like to sit back and read the posts about any problems if any and more importantly how they are handled.
I know that they have been holding beta testing for several months before the UB, Bet21, and UBT sites opened and I heard they fixed most of the bugs, but with so many players signing on now it seems that a few players (maybe with old systems are having problems still).
I heard hear several players who said they signed up for the beta testing and never got contacted. If a company doesn't even reply when your trying to sign-up, why would you think they will reply back when you have a complaint? Thats the biggest reason I'm waiting.
Now as long as these site take care of the players I won't have a problem playing on them, but everytime I see or hear of a player calling or e-mailing them and not getting any reply that bothers me.
The one thing that I like about Global (and why I use them for all of my satellite events) is because Pumi is normally online and takes care of any problems on the spot. I like that, even if I am knocked off while in the lead I get PISS, but Pumi at least refunds my money without any hassles.