To run Riak in production you need 5 servers.

Here all you need it S3(scales indefinitely) + 1 elasticache instance.

Awesome selling point.

There are things that are missing that are nice about Riak. Mainly libraries, map reduce, 2i, and solr-like text search.

This project definitely interesting for what it is though.

Why 5? We have a riak cluster running of 3.

"Here at Basho we want to make sure that your Riak implementations are set up from the beginning to succeed. While you can use the Riak Fast Track to quickly set up a 3-node dev/test environment, we recommend that all production deployments use a minimum of 5 nodes, ensuring you benefit from the architectural principles that underpin Riak’s availability, fault-tolerance and scaling properties."

Riak of course has a lot more features