UPDATE. This mouse is just the worst. Upgraded my rating from 5 to 1 star. I've included an image of STUPID's additional "helper" buttons just above your thumb. I think they are programmed as defenders and forwards. I can't tell you how much work I've lost because of these STUPID buttons. I have no idea how to deprogram them. And what, should I buy a new set? Hooray! I'm comparing this to Logitech, which I've owned for ten years. Ergonomics are very important to me, and responsiveness as I use a mouse in CAD. Durability is also important to me, but I can't say anything about this product at this point in time. In terms of signal strength, responsiveness, and ergonomics, it's worth it for 40% less than Logitech. In terms of durability versus Logitech, IMHO my Logitech mouse buttons died pretty quickly and it wouldn't be that hard to beat.
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