I have a trackball too.
absolutely love it, would never go back to a mouse.
It's more ergonomic and keeps you from moving your arm all over the place., I feel it's more accurate too.
Caveat...make sure you put your hands on the trackball to ascertain if it fits your hand.
I fooled around with some that got terrific reviews, but, did not fit my particular hand.
When you find one that fits, you'll know it.
This is the one I use, it's called the Microsoft Explorer. You manipulate the ball with your index,middle and ring fingers. On some trackballs, you use your thumb to move the ball, I personally don't like that.