I'm looking to add some sort of Offer Wall to my game and I have come across Super Rewards. http://www.superrewards.com/ I didn't have much like trying to find some dev reviews on them. Has anyone here used them for either their Offer Wall or Payment Processing? I'd love to hear what you thought of the service.

Anybody know of any other Offer Wall type service for a F2P game with virtual currency? Let me know.