I have Updated to 10.9.3, fps drops are a little bit better but still unsynced...
Apple still says it's the developer's fault for incompatability with mavericks.
This problem affects other VJ software as well.
Besides that, the answer always is that if you feel you need something, you should get it.
Does Resolume let you do better shows? Then get it. Do you really want to spend time using software you don't really like anymore, just to save yourself a hundred bucks and some change?