[awillen]

As someone who's implemented a usage-based billing system for an enterprise SaaS company, I think this leaves out an important practical consideration - what's the cost of building and maintaining the systems you need to support usage-based billing?

We used Zuora for billing but had to build the whole usage-based system ourselves on top of it and integrate. It was definitely not trivial (maybe there's a startup in there somewhere), and I would just say it's worth factoring in that cost when making this decision.