I love Clojure and like Datomic, but that thing needs some documentation. Really good documentation. I think that is one of the main reasons why it didn't achieve much penetration for something so good. Be different if you must, but document. Look at something like Kafka, where every little thing is documented. You can find documentation for every shell script! that ships with it, not to mention excellent api docs. They also specify how the clients work in detail, not to mention how Kafka works. With datomic, even though everything works well, most of the time I feel like I am driving blind. I don't know if something I wrote works in every case.