I haven't tried it since the previous version, but syncing a few directories with thousands of small files completely brought owncloud to its knees. The type of database used didn't matter, the syncing just started taking longer and longer, and because it hadn't started an auto sync in the last 10 (I think it's default time is) minutes, it would start another and essentially never be able to finish attempting to sync.

Apart from that issue, I thought it was quite good, will have to give it another try.