@bengesko They tend to have much better/plentiful integrations for non-US payment methods, and don't require you to have an account to pay through it I think. They also seem to be much less banhammer-happy than PayPal.
I haven't used it much (that I know of - I'm sure they function as the backend payment processor for many places) so that's about the extent of what I know about them.
@joepie91 Thanks! I've been looking at it and it actually looks a LOT better than paypal.
(I've only held onto my paypal because I've had it since 2006 and it's in great standing.)