I have always hated seeing outlets that had the wires in the back instead of on the screws, but I have seen a new (well, somewhat new) type of backwire, where yu put the wires in the back and tighten the screw and it holds the wire securely into place (and has more surface contact area - i took apart a GFCI with this kind of connection). I would lke to know, whether opinion or study, how safe this is compared to wrapping the wire around the screw (assuming wire is Cu and the proper gauge)
