We know we have more to do before we can declare CitusDB complete. Still, we have a version that many companies rely on in production today, and we aim to continuously improve upon our product using your feedback. We are currently updating our documentation to include all relevant information on new CitusDB features; so if you can't find documentation for a SQL feature or run into an unsupported feature, please send us an email at engage @ citusdata.com.
Your feedback is important to us for two reasons. First, it will help us prioritize our new feature releases accordingly. Second, our customers love the flexibility of PostgreSQL, and we can usually offer workarounds that worked well for others in the past.