We run both CDH and Cassandra at my employer. DataStax made a play, but they were Oracle level expensive, so we stuck with OSS.

CDH provides benefits in the early days, but at this point it feels more constraining. Their release cadence is slow, so we're stuck writing long term workarounds for bugs that we're fixed two years ago in the upstream project. The stuff that they are working on is half-baked and doesn't support what would seem to be trivial use cases.

I wouldn't be surprised if their ecosystem calcifies now that they are public.