I've now Logitech
I've been very happy with my serial ms mouse and my USB ms intellieye. The cable of the intellyeye broke eventually after 2 years of heavy use and so I needed a new one. I tried the cordless mouse explorer and went for rma the next day. It was laggy and produced some random motions when moved fast. Maybe that could also been a driver issue, but the mouse produced some high pitched sound, too 😱. I really hated it. I will not want to try another one with a radio connection. Then, I took a logitech, not with two optical sensors, but already one with this double dpi feature. It's good. It fits perfectly in a small hand. I like it as much as my old intellyeye.