Great trackball. Personally, after many years of intensive use, I have no complaints about the quality and ease of use. Now, on the second computer, the old G7 has finally moved into the best mouse world and I will most likely buy this trackball. The only thing that confuses me is that I can’t predict how 2 trackballs will work on nearby computers . If anything, I will have a spare, it’s not a pity. And one more thing, regarding the complaints about the smoothness of the scrolling of the ball - wash your hands, gentlemen, and do not forget to clean the bearings - fortunately, this is very easy to do, in almost a few seconds. In no case do not put pressure on the ball - touch it gently and just rotate it. Don't grab the buttery donut and then the trackball - you'll kill him very quickly. Do not hammer on the buttons with all your dope. And then it will serve you long and well. And you will be happy! I still bought a second M570 in the fall of 2022. Both worked perfectly on 2 neighboring computers, I didn’t conflict at all, until the left button began to stick a little on the old one and I saw off the pensioner with honor for a well-deserved rest. No other mouse has lasted this long! The ball in the new trackball rotates just fine, very smoothly and easily - it glides like pasta on a Teflon pan. The new one rotated a little tight, but in a few days it passed. Has worked for almost a year, the flight is normal. Personally, for myself, I simply do not see worthy alternatives to him! Yes, I also bought the Logitech Trackman Marble at the same time as the M570 for comparison. No, it is definitely worse than the M570 - worse sensor, ball rotation, ergonomics and coating. Left it to surf the Internet.
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