I have used it for a monitoring solution that we developed in-house and rented to outside customers. In retrospect we could have used PostgreSQL too, and would

I have used it for a monitoring solution that we developed in-house and rented to outside customers. In retrospect we could have used PostgreSQL too, and would have easier time. Hacing someone enforce schema on us wouldn't hurt either. But apart from a few gotchas (like not releasing storage on deletes - this should be fixed now) it worked quite well, so I am not in the hate camp (as opposed to HBase). I did however learn to appreciate strictness of SQL and would need very strong reasons to pick anything else than relational DB for future projects.