
I have already changed 4 of these mice. They began to do a little worse (there used to be gold-plated contacts and a braided wire), but the shape remained unchanged (two thumb buttons appeared, but I never used them). Got pros: Very comfortable in the hand when working in AutoCad. Clear sensor. Some cons: Extra buttons (there used to be a model without them, now - no). After 2-3 years, a double click or problems with the wheel and the mouse is discarded.