Bought this to replace a failing apple mouse and at the time didn;t see that the apple USB mouse was still available. This Logitech is horrible. Working in photoshop, I keep getting these very unwanted pop up menus or other nasty and interfering surprises that totally interfere with my work. The cursor seems to go all over the screen and if I put my finger on even slightly the wrong place the cursor either jumps somewhere and I must search for it or else another detested drop-down menu interferes with what ever I'm doing. Not realizing the apple mice are still available, I just ordered a replacement on eBay. The somewhat more expensive apple mouse is worth the extra money.