At the beginning, the product kept what it promised. Certainly one can not here ergonomics expect miracles, because that is definitely not the device, but with some Eingewönung it can also be used quite longer. For presentations or similar in any case sufficient. But after nearly six weeks (and not just excessive use) heard the trackball to function. The mouse buttons do still their service, but to be able to use without the mouse, the device is only a piece of expensive plastic waste. To ensure that this is not a problem with my computer I have tried the device on another Windows computer and a laptop with Linux, everywhere the same result. Since there are already more Rezenssionen with this problem here it seems to be not an isolated case. On this basis, I can not recommend the device.
