I use it especially after changing lenses and of course whenever spots begin to show up on your pictures. Which by the way may or may not solve the spot problem and require normal sensor cleaning. Regards,
There have been some reviews of sensor cleaning effectiveness, i.e. last year in DSLR user magazine. For every camera brand they tested, the self cleaning actually increased the number of dust spots! That test was done before Nikon came out with the D300, but still I was cautious. At one point I did have a dust spot, which I confirmed by taking a picture of the sky. So I gave it a try, and to my surprise after one auto cleaning the spot was gone. But in any case I use this feature only when needed.
I also remember seeing a review that specified the camera should be in it's normal orientation for a landscape format photo before doing the sensor shake so that the particles dislodged will fall onto the sticky bits below the sensor. If that is true then I don't want to have to focus on how the camera is oriented when I turn it off or on.