I would say, watch out for Payza.
Do you remember when Paypal was new? At that time eGold was the big ecurrency. As Paypal was growing, they messed with a lot of eGold people's funds, and a lot of eGold people never got their funds back.
Something like the Paypal thing happened with Payza. I don't know if anybody lost funds at the time that Payza changed its name from Alertpay to Payza, but there certainly were some rumblings. Then, a little while back, Payza caused a lot of U.S. people to lose funds, by not alerting them about the handwriting that was on the wall, and warning their U.S. account holders that trouble might be coming.
According to Payza's own statements, they were doing U.S. transactions after their financing company in the U.S. had told them they were cutting them off. The finance company gave Payza time to wind down old transactions, but Payza kept right on transacting new transactions. Some U.S. people lost funds through Payza's non-conformance with their U.S. financer, to stop making new transactions and to finish up the old ones.
Did U.S. people lose their funds because of bad intent on the part of Payza? Who can tell for sure? But it was at least lack of good judgment on Payza's part. They knew for at least weeks (maybe months) ahead that their U.S. finance company was cutting them off, and they didn't warn U.S. customers or stop the new transactions that they made.
I'd say, watch out for Payza, especially if you are in the U.S.