risc / cheegs... I actually got to try the joystick mouse by 3M at Office Place. It seems to be better than the traditional choice but I expect the vertical mouse to be even better since its builds upon the 3M design and enhances it through other useful ergonomic features. Additionally from whatever I've read online the Evoluent vertical mouse has an easier learning curve - will tell you how true that is in a few days.
Just an update, i’m still using this vertical mouse at my workplace. People look at it and ask me why i have a joystick on my desk and i have to explain to them its for cripples like me
It was a bit tough to get used to in the beginning, but after a couple months of fiddling i have become very comfortable with it and its been over a year using it. The idea is that you use your whole arm to move the mouse around and bring your wrist movement down to zero, which is the most likely place you will experience pain due to repetitive stress. Moving your whole arm around means you need more room on your desk to move around. Seems very alien in the beginning but you get used to it.
The left mouse button is controlled by the thumb and double-clicking with your thumb is not fun. To counter that i have sortve adjusted my habits to reduce double clicking unless absolutely necessary. Or sometimes i just cheat and bring my index finger up to double-click.
I have a regular mouse plugged in too and placed far away so anytime my colleagues need to use my computer they just grab it and start using it.
I must say my wrist has received a much deserved break courtesy of this mouse and i would recommend it to anyone looking into a proper ergonomic solution that not only looks weird but also does what its supposed to do.
Become a lefthander and forget all those funny looking mouses. Any standard mouse works great. And no problem with RSI issue’s or a mouse arm etc
but I prefer any wireless mouse by Logitech. Though since most mouse are made for right-handers, so currently I love and own the one which comes with the Logitech Cordless Desktop S510 or S520.
and forget all those funny looking mouses. Any standard mouse works great. And no problem with RSI issue’s or a mouse arm 
etc