I tried using AP to mask objects in front of a greenscreen. I used the color range selection ("Select" -> "Color Range"). After that I wanted to improve the edges. But the "Refine" function doesn't seem to work with this kind of selection. So this type of selection is very limited.
I also want to address again a very old problem with the Refine dialog: The output as "Selection" and as "Mask" is of poor quality. It also differs from the preview and therefore cannot be used. The only output you can use is "New Layer". Are you aware of this fact?