Adding PayPal’s Express Checkout to Magento is extremely easy. I was relieved to learn this after PayPal told a client that if they didn’t offer Express Checkout along with using Payments Pro their transaction rate would go up by .5% (the ethical considerations of PayPal forcing their paying customers to do this seems a bit unclear to me). Wanting to make sure I didn’t miss anything easy (we haven’t used Express Checkout before as our clients don’t generally like the big PayPal logo on their store) we just followed these simple steps, and we were done.
The moral of the story? Magento is easy, PayPal not so much.