Just installed this; and it's nice to have control over the buttons.
However, the performance seems to have suffered a little; in photoshop it is pressure sensitive (YAY!!!) but it is laggy as hell. Yuck.
They just released an updated version. 7.1.2 it seems to immediately have improved my accuracy/calibration. Especially near the edges. Didn't even recalibrate after updating the driver and immediately noticed the improvements.