Not good as immediate payment as it can take up to half an hour for you to receive the code after the guy has paid.
Otherwise, foolproof and unrefundable.
Of course, it's not real money, but good if you shop on Amazon anyway.
Paxum is a very decent payment provider for the adult business. The fees are good, especially if you verified your bankaccount. The only problem that I encountered was that it took me ages to get all the paperwork right. When everything was eventually in order I was happy that I took the effort.