Think for yourself whether it is worth buying a mouse for 4500 for a year, when simple models for 300 last almost forever. Dear Logitech, give an opinion that this is a manufacturing defect so that I can return the money, even if the warranty has ended. Has pros: Design, smooth glide, comfortable weight single battery mouse. With its cons: After a few months, problems with scrolling begin. Replaced under warranty. Same with the second mouse. They cannot help to issue a conclusion on the return of funds, recognizing the marriage as a manufacturing defect. But even for the first time I asked if it was possible to return the money, when it was under warranty, they replaced it for me. And now the warranty is over.