I have been using this mouse for about 2 years now, and I must say I am quite impressed with its durability. I use a computer a lot, and I do mean a lot. This mouse has endured easily tens of thousands of clicks, no doubt miles of scrolling, and many many falls from about 2½ feet. And from all this use and abuse, the only damage to it is some minor surface scratches, and a worn white spot on the left button from all those thousands of clicks. And the zoom feature is hands down the best I've ever seen in a mouse's factory software. A comparable mouse from Logitech's zoom feature was all but unusable. The zoom button was in the worst position, right behind the scroll wheel, and was always bumped by accident. I am normally not enthused by the quality of Microsoft's products, but this is definitely an exception. Very ergonomic (to my hand at least, I do have large hands) and well worth the money.