Not impressive I know, however I was able to get a Proteus Spectrum off of the original Proteus Core S/N. I bought the Proteus Core a year ago before I even found out about SEing, and used that serial to get a replacement! I do have one question though, can anyone use the serial on the replacement mouse or is it registered to me already? I was going to try to trade someone my new S/N for a S/N for the G810 Orion. Obviously, that won't work if it's already registered to my information.