As read in other reviews / comments can the left mouse button for a o. Two years. Either they do not or only very weakly clicks. In addition, when she finally clicked (left mouse button), then click several times (as a kind of double-triple-click). Correct annoying. The problem occurred in my case, after only one year. Then I have the mouse exchanged after the dealer could reproduce the problem on his computer more than once. In exchange, I get the same mouse. After one year, the problem occurred again. Therefore, I can not recommend the mouse from this perspective. Otherwise, the mouse fits comfortably in your hand, the otherwise annoying tangles is omitted since a relatively short but adequate cable is available.