Negative Positive
Title: Not up to the traditional Kensington quality.
Review: This is my third Kensington trackball in the last 15 yrs.It's the worst one too. Kensington also doesn't support MouseWorks for the Mac anymore and no plans to update it for Leopard. I didn't try to install it. The lower buttons work right as a normal click and right click. The upper left button does something odd with the scrolling that I find irritating. The upper right button... well I don't know what it does.The scroll ring is very nice and it's nice not to have to clean the rollers of the old trackballs (this one uses the red IR LEDs like modern optical mice do). Beyond those two points, there's nothing nice to say here--If you're buying this expecting 1980s/1990s "TurboMouse" quality, you'll be disappointed.But if you're like me and need some varied input devices to keep your hands from aching with RSI from a single type of input device, this might be an OK purchase. Otherwise, you'll probably wind up returning it.
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