Say you have 1048 photos on your camera and 1013 photos on your PC in the folder with your camera pictures. In Windows 7 you could skip files in the destination folder and just copy the NEW files from the camera to the folder.
But now with Windows 8 they step back to the stone age and your only other option is to "replace all", which SUCKS.
Only paid $40 for Windows 8 Pro. Knowing what I know now, Microsoft couldn't have paid me $40 to "upgrade".