I was under the impression that Yugabyte requires signing a CLA to contribute which leads me to avoid it for fear of them relicensing the thing when the VC's start squeezing. Also: very unique and single vendor driven. Seems like too much of a risk longer term but that is just my take.

EDIT: in response to your question I did run a PoC of it but it had issues where I wasn't able to create very large indexes without the statement timing out on me. Basic simple hand-benchmarking of complex joins on very large tables were very slow if they finished at all. I suppose systems like this and cockroach really need short, simple statements and high client-concurrency rather than large, complex queries.