We're also using Adyen. The support is pretty good, the API/website/documentation/customization options are all terrible. But it's one of the few PSPs that provides support for lots and lots of payment methods (like: VISA, Amex, MC, PayPal, but also a lot of local stuff like iDeal, Mr. Cash, etc.)

Supporting a local payment method (iDeal in our case) is a pretty big deal in our case, since it accounts for +50% of our total revenue. Don't underestimate this if you're planning to launch a European SaaS business!