I have. The experience is pretty bad. The nib is still really fat compared to a 'proper' Wacom stylus, it's battery powered (WTF?), and because the pen tracking built in to the pen instead of the screen, it depends on each app developer to support it. Very few apps support pressure sensitivity, and even fewer have palm rejection. When the digitizer is built in to the screen, stylus support and palm rejection is universal system wide.