Paypal is horrible (We had this happen so many times...) and there are many cases where they simply stole money without giving reasons or ability to dispute without going to court against a giant, but it's just not possible to go for a competitor, because that would cost you too much sales from clients who don't have/want to use a competitor. And a lot of Europeans at least don't want to use their CC online.

We tried AlertPay which works fine, but the fees are too high, still, they seem a good alternative if you want something that just works for now.