VR and fast (aperture) glass are two completely separate things. They can be super great together, but either on its own has its own merits. Fast glass comes into its own on action in low light (to a point anyway) and the times you want to isolate a background and can't set up for it any other way. VR on the other hand helps your images almost completely across the board. In low light, in bright light, when panning, if you haven't experienced the improvement it can make, you need to try it. I'm not sure that there isn't something special about the way any form of optical image stabilization can effect the quality of digital images. I believe that all the manufacturers are realizing this (and maybe always did) and incorporating it more and more into new bodies and lenses. It will probably become more and more of a standard feature as time goes on. There's no excuse for not using something as valuable as vr if it is available.