I've been working with Datomic, as a developer, in a production environment for the last 4-5 months. In terms of the work done by your ops guys, I'd say it really depends on how you're using it. Datomic has it's own AMI, which can be a hassle if you're used to rolling your own (which we ended up doing). I'd say one of the biggest challenges to overcome on the ops side is dealing with transactor failures. If a transactor dies, then the data from the peers will likely just fall on the floor. If you use DDB as a store, you have to keep an eye on your provisioning and scale appropriately.

Yes, same, I think a lot of people would be interested.

I would ask coolsunglasses as he's been using it in production for far longer in a bigger installation than we have.