I’ve been a die-hard Kensington trackball fan for almost 15 years. I owe my lack of RSI to trackball usage. Other than tripping up visitors to my office who can’t figure out which button to click, the only drawback for me has been the lack of a scroll wheel. Kensington has ably attempted to incorporate a scroll wheel or equivalent in several models. They’ve placed an actual scrollwheel at the top of the device, which doesn’t work for me because I have to move my hand to use it (I don’t know if people with bigger hands have the same problem). They then had the brilliant idea of a “Scroll Ring” which encircles the ball, so you can spin the ring and leave your hand in position. I tried the first version of the ring but didn’t like how clicky it was so I bought a different model. I haven’t tried the latest version to see if it’s improved because these darn Kensingtons refuse to wear out and I won’t toss my trusty one aside. But now Kensington has come up with an even cleverer concept: use the ball itself as the scroller. Just turn the ball. Their SlimBlade Trackball launches soon with this innovation plus a sleeker design. I can’t wait to try it.