For any guyz that have any shoulder iusses at all this is the only way you should be benching. In this instance partial rep would mean not going lower then your shoulder blade on the bench. This way you can still bench and still have those benefits. Maybe not the full extent, but better then not benching at all. For me this means that I get to within roughly 3" of my chest at the bottom.
Does that last bit of stretch make that big of a difference? Dunno, but it dosnt matter as that is what I can do on a week to week basis.