My standard mouse is worn and I look forward to a new mouse.

This week I bought a new one, a logitech M500, but that is even worse than the old one.

On the scroll wheel is too much slack and therefore it's not accurate enough.

So should I be looking at a better mouse.

I was wondering if a trackball mouse is a good tool in order to work in SW?

http://www.logitech.com/en-us/mice-pointers/trackballs/devices/189

Is there anyone who has experience with it?