content: This was one of the first mice I ever bought. I've had it for at least four years and it's performed reliably with every computer it's been connected to. I've brought it with me from job to job and back and forth from home and have never had any problems with it. The buttons always click crisply and the wheel revolves easily. Now I'm buying another one to permanently connect to my home laptop workstation so I can leave one at work and one at home.