I had an R2 and Twinder for a bit. I agree with Peter's comments, though at times I took the winder off the camera due to the added weight, and I can't say that I used the winder more than the thumb lever when it was on the camera. I did find that the added weigth to the camera became an issue if you carry the cam for any period of time. I ultimately sold the Twinder and replaced it with the side grip. It gives you the grip and control of the camera without the added heft.