I have galaxy s3 and a Mac (not sure of lion or mountain lion.) Downloaded android file transfer and it works but not exactly like it is supposed to. I do not get a DCIM screen to appear that would give me file choices. But when i open iphoto it does show my samsung device. i can not see the tile images of my pictures, they present as blank but once i transfer them from phone to iphoto they appear. However,I do not see my videos or any way to do anything with music. I have the phone set to PTP and no debugging. If i could just make transferring pictures, videos & music simple I will love this phone. thanks!