Not a super common brand to see out there, but I love my Nova Slider X600. The "feet" on the bottom when combined with a teflon mouse pad means it slides oh so effortlessly.
The numbers on the side of the mouse are called macros. You can set them to do whatever you want, like if I pressed the number '3' macro, I could make it so that it pressed a keyboard button like k. So whenever I clicked the '3', the computer would type 'k'.