Pros: Simply an indispensable tool in CAD applications. Moved the most necessary commands to the right panel of buttons, which significantly speeded up the work and made it more convenient. The most important thing in this model is three full-fledged buttons, removed panning from the scroll to a regular key, wildly convenient. Has cons: You have to solder the left and right buttons, the interval is different, they go from three months to six months. The model disappeared from the shop windows, bought on ebay.