Trackballs have always been niche products, and in today's world of motion and touch-based input devices, might seem like throwbacks to another era. But if you find you just can't beat a trackball's ergonomics, there are still a few good ones to choose from, and the Logitech Wireless Trackball M570 is one of them. It's lightweight, includes well-placed buttons and a scroll wheel, and cradles your palm comfortably as you use your thumb to operate the ball — if you're a righty, that is. The 570 is strictly a right-handed model, though Logitech still sells its Trackman Marble, an ambidextrous, fingertip-controlled trackball.