My experience with Zuora is that it's a feature-complete payments subscription that's an unholy pain to work with. We chose them over Stripe before Stripe has ACH.

My favorite part is that 25% of their revenue is professional services, and their professional services are sold essentially at-cost. You're going to need somebody to help you get set up, but at least the pricing on that extra headcount is fair :)

They're after large customers, and this is what they get.

"As a substantial portion of our sales efforts are increasingly targeted at large enterprise customers, our sales cycle may become increasingly lengthy and more expensive, we may encounter still greater pricing pressure and deployment and customization challenges, and we may have to delay revenue recognition for more complicated transactions, all of which could adversely impact our business and operating results."