I just played with mine. The key is to associate the pressure of the pen with the tool you're using. For a paint brush, I associate pressure with opacity. You could also associate it with size, or hue, or any number of things. Without knowing your editing routine, it's hard to give you specific suggestions. But try correlating pressure to opacity first. That works well for the paint brush, eraser, and clone/stamp tool...at least for me.
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