I was having a look around at our local The Source today and saw a T650 on sale for 30 bucks Canadian. For that price I decided to give it a try. I have several Logitech keyboards and trackballs and haven't been disappointed with any of them. I have a K400 keyboard that has a touchpad built into it I use on my Media PC. This thing takes it to the next level with the gestures etc. It just works so well with Windows 8.1. I'll still use my M570 trackball for gaming, but for everything else this thing rocks. My keyboard, trackball and touchpad all being Logitech and wireless, means I can link them all on the one unifying receiver.