>> Not to mention a lot cheaper than a dozen
>> occupational therapy sessions due to tendinitis or carpal tunnel
>> syndrome.
>
> Nobody gets tendinitis just from using a mouse.
>

I have two weeks off work, 10 physiotherapy sessions and a visit from an 
occupational therapist at home to redesign my work space that disagree 
with you.

When you need to use the mouse with your right hand, you need to lift 
your arm over the numeric keypad and off to the side to grab the mouse, 
then move the arm back to the keyboard so that your can continue typing. 
  In most cases, this means lifting your entire arm from the shoulder on 
down, whereas if you were using your mouse left-handed, you'd only need 
to move your wrist, with your elbow still resting on the chair's arm rest.

Repeated sporadic use of the mouse over the course of two long mights 
and days of work did cause me to have tendinitis bad enough that I had 
to be driven to the hospital since I could no longer lift my right arm 
at the shoulder, and it would have been too dangerous to try to drive in 
those conditions.

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