After being put to service for a period of four years, the wheel eventually reversed and failed. The issue was remedied by disassembling everything and giving it a thorough cleaning. In addition, the braid was torn closer to the connection point of the mouse itself (the use of black electrical tape is helpful in this regard, but it may have been soldered). keep using and enjoy! Various advantages: The X7 is an attractive and dependable mouse with a convenient key configuration and high-quality construction throughout, including the mouse's body. Laser. Cons: The cable is brittle where it connects to the mouse (this issue has been addressed by adding rubber braid).