I used it for awhile for "prod" for a toy project. I was scraping nearly every sale across every Target location for awhile. It was fast and easy to use. At the time many (read) queries had bugs of various kinds, requiring strange workarounds to get certain joins and whatnot to work (and not just throwing errors either -- often reporting zero data when there was data there, things like that) and not really being composable. Their CEO (CTO?) responded to my saying as much at one point and mentioned that they had just spent a lot of time fixing all their query logic and writing enough tests that it's actually usable now. I haven't had a reason to check yet, but the next time I'm doing any time-series thing and don't want to write the data layer myself I probably will.