1. Marriage of the scroll wheel - proved to be somewhere after a year of use. It is expressed in the strange behavior of web pages when scrolling. They begin to travel back and forth, live their lives in general. The bug is present only in browsers. It doesn't show up anywhere else. The manufacturer is aware and even released a firmware ate to fix it. It did not help me, but knowing how the company treats warranty obligations, be calm. Write to their support with a detailed description of your problem, then send them a mouse and get a new one. There are thousands of such stories on the Internet. Works even with old mice (within 5 years). This is not Apple for you))) 2. The location of the batteries is located directly above the board, which can lead to unpleasant consequences, like mine. After a year of use, the mouse asked to replace the batteries, which I did, grabbing the first ones that came to hand . One of the batteries turned out to be old and leaked . right on the board! The mouse naturally did not come to life even after cleaning with alcohol. Conclusion - DO NOT use low-quality batteries with this model and you will be happy for many many years! PS: I have been using the mice of this office since the time of the king of peas. Everyone is alive, except of course the patient described above) Instead, the same one was simply bought. I use and enjoy in any application (Internet, 3D modeling, Battlefield)