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This review is from: Logitech M570 Wireless Trackball - Graphite [UK Model] (Accessory)
I have tried to work without these trackballs but I always seem to have problems with mousepads. Using this I can work more quickly, for longer and, most importantly, I don't get wrist or shoulder pains. They cost more than most mice but for me they are definitely worth it. The only possible issue is how long they last - my last couple died after only two years. However, I did notice on the packaging this time, that they are guaranteed for 3 years.