I've used Versant back in 2001. It was terrific and very fast, but wasn't a good fit for reporting/analysis.
Versant was building systems that were updated on the fly without shutdown, which was quite an achievement back then (and probably still is: Imagine updating a running instance of PostgresQL)
The company I work for runs dozens of Versant instances and it generally is immensely fast and rock solid.
The Object-Oriented Database (OODBMS) space is basically just Versant. Actian however seems not to be developing it actively anymore and it's generally not that much advertises (they rebranded it as "Actian NoSQL" apparently).
I wonder if anybody else still uses it (besides us).