Ask HN: Favorite recurring billing payment gateway?

A while back there was a thread of

https://news.ycombinator.com/item?id=4975790

And I was wondering in the past four months, has anyone had any good experiences with any other recurring payment gateway which won't cost an arm and a leg?

I'm looking at paypal pro with enhanced recurring billing for $20 because it is the cheapest at the moment, but open to other ideas.