But does it overcome the significant problems OP highlighted? If I can remember my plus address it doesn't do me much good when my neighbor exactly below me ha

But does it overcome the significant problems OP highlighted? If I can remember my plus address it doesn't do me much good when my neighbor exactly below me has the identical plus address. Also, I would think you'd find a lot of people have trouble remembering: > 8GC2CMXR+X6 Though, perhaps at times all you need to remember is: > CMXR+X6