I have used it for 2 weeks and I am really delighted with this mini wireless optical mouse. It is perfect for my netbook. Works really well and small enough to stow in the soft case I have for the computer. I can leave the tiny USB receiver left plugged in at the side of the netbook. The seller seems to be excellent (arrived quickly and have had a follow up email to check I am happy with it and have been told they will check again in a few weeks !). I am thinking of getting another one.