The "Microsoft Natural Keyboard pro" has the typical key positions. And it is  my prefered keyboard. But the MultiMedia Natural Keyboard has a big "Del" key and the "INS" Key is not on the normal position. If you look at the "Pro" you can see the difference between then. And i think this can be a problem if you work for years with the "pro" style and than you don't have the INS and DEL Key on their "normal" position.