I just tried both the dust and spot versions and it really does work. I first tried the dust on well dust spot in areas of the sky, then I tried to clean up a small bird in the distance - a spec really and it didn't work so I just changed it from dust to spot and the bird was gone. Then I tried small zits on a model shot with spot and that went great so I tried to clean up some red blotches and that worked as well as some shinny highlight spots on the models face. Actually I'm pretty impressed. You don't have to tell it where to take the source from. There was one zit really close to a strand of hair and I deliberately put the ring touching the hair and it did not mess this up or bleed in the darker color as lightroom or PS would.