[quote1225127940=Auron]
That's a different mouse. I wonder if your arm will get tired cuz you're holding your arm off of the desk so high. Let me know how it works.
[/quote1225127940]
you dont hold your arm in the air.
a conventional mouse, your arm rests on your wrist. your wrist is in a perpetual slightly upward slant position, and in that position is required to twist left and right. This is what causes all those medical problems.
vertical grip mice, like the one narf just bought and the one that linked to, have your hand rest on the side of your hand, the "karate chop" side.
here, basicaly, take a glass of water or a coke can or whatever and hold it with your hand wresting on the table. Now pretend its a mouse.
your wrist no longer carries the load, which is transferred to the arms entirety... atleast in theory.