Ask HN: Where has Cosmos DB fallen short? Is it gaining traction?

CosmosDB has a few really interesting features. It has 5 different consistency models, ranging from strong to eventual. It has an SQL, Graph, Mongo, KV, and Cassandra interface out of the box. It has scalable throughput, scalable storage, HA, cloud function triggers, cloud function stored procedures (within which are atomic transactions), and automatic indexing of any field.

Has anybody here committed to it? What have your experiences been? From what little fiddling I've done, it has been reasonably straightforward to use.