Originally posted by mattt Old school film days is 1/(2x Focal Length)... so 100mm equivalent field of view should have 1/200 shutter speed to eliminate motion blur.
Go through your catalogue and see how many photos below a particular shutter speed at a particular focal length to find out if your normal shooting will be affected.
Using Lightroom, I have discovered of the 1888 images made at 55mm, 256 of them were taken at shutter speeds of 1/50 or slower... that means I'd be affected by no SR at least 13.5% of the time.
To further that analysis, I have published 978 of those 1888 images to Flickr, and of the published ones, 14 were taken at what could be considered a slow shutter speed.. just 1.4%
Probably not a deal breaker.
Much of that time, you may have been able to open the aperture up (with a small sensor camera, keeping plenty of depth of field) or raise the ISO (at least some of the time with acceptable results), so that number of shots saved by SR may even be lower. I'm finding it very handy on the K-1 though, where I'm much less likely to want to shoot wide-open and lose so much DOF.