I've already bought the keyboard the 3rd time. Every now and then the old keyboard inputs responded to somewhat sluggish. The same is true for the keyboard in the office. The main problem is that disappear after some time, the designations on the keys respectively wear. That should not be at a keyboard with target business sector. Nevertheless, my recommendation to buy, because the ergonomics are unbeaten. And Logitech seems to think that such ergonomic keyboards would supposedly find no buyers. However, the opposite is the case.