Yeah, it's scary to think a bug could exist in the data when you're making potentially huge company decisions based on it.

Some of Amplitude's paid reports do look really valuable. Like this one: https://amplitude.com/behavioral-cohorts

I've written custom reports like this one and I'd rather not have to write them again. It looks like some of the reports are in beta. Maybe they'll release them for free in the future as they work out the kinks.