I have both MS Arc mouse and the Logitech Ultrathin Touch Mouse (T630). My Arc is USB so that uses up the USB port and it sticks out. The T630 is great and the Bluetooth always connects and stays connected, but one bug... when I use the SP3 at home plugged into USB hub with wireless MS mouse, the cursor speed setting is always knocked down to slowest and I have to reset it in mouse settings every time. If I always used the T630, that wouldn't be an issue.