I was evaluating it recently but it's not FOSS, so buyer beware. I'm totally fine with commercialization, but I hesitate to build on top of data stores with no escape hatches or maintenance plans–especially when they're venture backed. It is self-hostable, but not OSS.

It's a startup founded by -- and built with tech coming out of research by -- some well known people in the DB research community.

Successor to Umbra, I believe.

I know somebody (quite talented) working there. It's likely to kick ass in terms of performance.

But it's hard to get people to pay for a DB these days.