I was a Recurly beta user. 2010 I think. Just after I finished integrating them and pushing it live on a 50k user site, they upped the pricing (and changed pricing models entirely) with no grandfathering. There was some big hooplah on their blog over that which led to some kind of special offer for existing users, but it still wasn't the same as when we signed up. You were probably in during a later price change.

I wasn't cool with having the company I was about to entrust my income -- putting food on my table -- changing the rules on a whim like that, so I had to roll everything back and do billing myself. I'll never trust 'em again.