Earlier quoted context omitted.
Great service and full PCI compliance. Watch out for monthly minimum and early termination fees. Not supported by any of the SaaS billing frontends yet (though Spreedly is willing to make it happen).
Is braintree willing to negotiate on these costs?
There was a discussion about that on HN that a while back. It sounds like the answer is "yes," but only to a point:
http://news.ycombinator.com/item?id=598974