It's been stable for us since deployment eight mounts ago, although we haven't pushed it too hard - our data is relatively small and queries not too complex.

From what I've seen, our use has a lot in common with Seed-DB, only in a different economic sector/activity.

There is a similar question on Cayley's google group - https://groups.google.com/forum/#!topic/cayley-users/nirhCbq...

Also, I know it's being used by some companies. you can ask directly the people who uses it on IRC - #cayley (freenode).