Summary: I've had trackballs almost exclusively since I began computing 20(?) years ago. Started with Microtech. Eventually went with Logitech and am now using the Kensington Orbit. There is no trackball out there that is perfect. Few are even adequate. The Marble Mouse and the Orbit are both pretty good.
Summary: When I was looking for a replacement for my Trackman Wheel trackball for my laptop, I knew I wanted another trackball. Since they don't move around like a mouse, I don't need as much space to use it. As I move my latptop around and use it in smaller areas, this is very important.
Summary: I've been disappointed as I read that it can`t scroll. Fortunatelly, buttons could be reprogrammed. I find that I don`t use forward button (little button on the right by default) so often, and I choosed "universal scroll" instead.
Summary: I'm an engineer using mu computer in the car. I have loved the Logitech trackball for years. I wonder who on earth could ever want to substitute the scroll wheel with the ball!? - And replace index finger left click with thumbs left click!!?? This is not Logic!!
Summary: For the most part this is a 5 star rated trackball but Logitech removed the 5 button combination (Large buttons pressed together) and thus removed the functionality of middle button/scroll wheel. When I bought my first track ball 10 years ago it had this function with the old MouseWare drivers.
Summary: I bought the MarbleMouse mainly for the ball itself. I do a lot of photo and video editing, which involves a lot of clicking. I find the position of the 4 programmable buttons awkward. They are symmetrically designed; the human hand is not.
Summary: PROS I have had this mouse for a couple of months now. The mouse is easy to use and setup. The ball rolls very smoothly and the mouse has such a compact design that it can fit in places where mice or other brand trackballs cannot fit. This is a decent mouse but it's not the best thing out there.