Summary: I fell in love with trackballs when a friend gave me one of your old ADB Turbo Mouse trackballs. It's still hooked up & working on an old Mac. I almost bought an expensive ADB to USB adapter to use it with my MacBook Pro. Then thought, why not put the money towards a new trackball.
Summary: Having fought and beat carpal tunnel syndrome, I make sure to take care of my wrists and fingers. Thus a mouse isn't for me, not even a vertical mouse. I've used trackballs for years, and gone through quite a few, my favorite being the older Kensington Orbit.
Summary: I freaking love this trackball! I had, well still have a Kensington Orbit With Scroll Ring, and it is a nice trackball, but the Slimblade blows it out of the water. I honestly was nervous about purchasing this, especially with some of the reviews I had read about it, but I am so glad that I did!
Summary: This is my second SlimBlade Trackball Mouse. I love it!! It's easier on my hand as I've had carpal tunnel surgery already. I do a lot of data entry and for me it's faster and easier and more comfortable.