I turn it off when using the DV rigPro because there is no jerkyness in the way that the rig moves. It's a lot like using a tripod, so the OIS can actually cause more jerkyness in your pans and quick movements. I would definatly say, turn of OIS.
Thanks danny. I have to say though, the shorts on my website are all things that I did before I had the dvx or even the DV rig pro, but thanks for the encouragement.