[jwr]

I hear you talk a lot about real-time — I guess that's a niche that you noticed. But let me add to that: being "distributed" without major pain is also big. There is a niche to be filled on the (loosely defined) "distributed" spectrum between, say, Redis and Cassandra, and so far you seem to be heading right for that place. I like that a lot and plan to use RethinkDB for a number of projects in the near future.

[exelius]

What about Couchbase? Specifically for the niche on the spectrum between Redis and Cassandra.

[ma2rten]

My understanding is that Couchbase is just a key-value store, while RethinkDB has much more features including complex queries, sorting, joins, indices...

[jchrisa]

Couchbase has indexing, map reduce, and full text. Also a mobile sync connector.

[vogan42]

Couchbase conflict resolution is really basic, assuming you mean distributed in a wan context (eg xdcr). Riak would represent the state of the art in this respect (random internet endorsement, I'm not affiliated with anything, just a user who has worked with both systems).

[jchrisa]

Our XDCR doesn't have quite the power of our mobile sync conflict management, but I'd wager to say what we do for mobile is unbeatable as far as delivering unsurprising behavior for offline / p2p applications.

[EugeneOZ]

Minimal hardware requirements are... huge.