hi
I had sprained my wrist, and when I went to the doctor's office, she had a vertical mouse. She said it would help with carpal tunnel and also the stress on my sprained wrist. So she recommended that I purchase a Logitech vertical mouse. I have had this mouse now for almost two weeks, and I love it. My wrist does not seem tired, and I do not have any pain at all. I would recommend that anyone who works a considerable amount of time on the computer using an old conventional mouse switch to a vertical mouse.