Initially, the mouse worked on a tabletop, which was wiped for ten years by another mouse. Under such conditions, she noted that the cursor did not always move smoothly across the screen (very rarely, but enough to pay attention. With the advent of the rug, the problem disappeared. Its pros: - Easy; - Well lies in the hand; - Software (easy to understand); - Convenient keys. Different cons: Not that it's a disadvantage. Rather, things that may be for someone: - Without spinning through soft dpi is low; - The wiring is thin (in my case, I'm worried about it); - Not quiet.