Migrated from PostgreSQL and DoDoStorage (in-house document store) to CouchDB:
Currently we are running CouchDB with subset of our tracking archives. This subset is about a quarter million documents of wich 20% or so have attachments resulting in a database size of about 5 GB. No complains so far.
This CouchDB case study provides details about both the data model and data access.
Original title and link: CouchDB Case Study: Building a Track and Trace Application (NoSQL databases © myNoSQL)