After the total failure of ODBMS (at least from an adoption point of view), it seems obvious to me that the NoSQL movement is perceived by (ex) ODBMS players (like Versant, db4o, Orient) as an opportunity for a resurrection.
This IMHO exactly the case of OrientDB which is the result of the rewrite of the Orient ODBMS engine as a document oriented database (in other words, re-branded to fit in the NoSQL niche market).
But while OrientDB benefits from the experience acquired in the ODBMS field (the author has more 10+ years of experience in this field and is member of the JDO expert group, how surprising), I'm not aware of any projects/customers using it (and I believe they would publish some testimonials if they had many of them). Some possible reaons:
- The product is new.
- Only a very few people might need a NoSQL solution.
The conjunction of both points means you won't see "mass adoption". At least, this is my opinion.
That being said, I agree that OrientDB looks interesting.