I install this on my work laptop . it have the laptop screen and 1 external monitor span . this device allow I to add another external monitor . the speed could definitely be improve by support usb 3 . you can certainly notice a bit of jerky motion . for work , however , this be fine for I . if you laptop or computer support usb3 , I would recommend skip this unit and get something else . my laptop only support usb 2 .