Most startups don't realise that subscription billing will become a headache as they grow and add a sales team. Bunny solves this with a single subscription billing solution that integrates for self-service and allows sales people to quote creative deals.
I wish we had had this product when we started OneLogin. We would have saved a lot of time and money by having a strong RevOps foundation to scale our business on. Instead, we had various, disconnected point solutions and a bunch of manual processes to make up for it. RevOps may not be a huge priority when you start a SaaS company, but it pays huge dividends later on if you get right from the start.