Ask HN: Which SaaS companies do you gladly pay?

I've managed millions a year in IaaS/PaaS/SaaS spend, and most companies I begrudgingly pay (PagerDuty, New Relic), but there are a couple that I wholeheartedly recommend and I'm happy to give them my money:

Fastly – product is so much better than competitors and their support is phenomenal

Catchpoint – product is extremely powerful and I don't think there's someone else that can compete with their visibility to/from/within China

Which SaaS companies do you gladly pay? Why?