However being system admin of a PostgreSQL database managing a lot of timeseries I was just like "meh use timestamp and good index, what's the deal?". Also for performance sake just cluster the data using the most used index...
But yeah I guess if you really need NoSQL this should be nice. However sharding based on time will probably be one of the easiest approach for horizontal PostgreSQL deployment.
I only noticed it because I was shocked that there was an actual comprehensible value proposition in a blogpost about a NoSQL product.