Has anyone used Amberflo for billing?

I’m trying to build usage based billing into a microSaaS product but it’s proving a little difficult with Stripe. So in looking around I found this service which looks perfect for it: amberflo.io. But I’ve never heard of it before and billing I feel like isn’t something to play around with since peoples money is on the line. Has anyone tried it or had any luck going with an “unknown” service like that?