Interesting question from Koastcanuck. This is my experience:
In januar 07 I bought the p1610. After some weeks the digitizer started to behave strange. When drawing the pen along the under long side the curser/arrow moves upward at two places. Or in the portret mode on the right side the curser suddenly moves away from the pen position. If I draw a straight line on the right side in the portret mode from the upper right corner to the lowe right corner it gets a little bubble at the top and a big bubble near the bottom. This happens only while using the pen and not with the pin or mouse. We recalibrated a few times, but it didn’t help.
Fujistu replaced the screen with a new one. It lasted some weeks and we got the same problem again. Again Fujitsu replaced the screen. It worked well some weeks and then it started all over again. After many discussions Fujitsu replaced the whole computer. I was happy. After a few months though, the same problem has started again. At Fujitsu-Siemens they say I'm the only person that has this problem. Well I'm wondering if that is true. I'm also wondering what I am doing to get this problem. I just use the p1610 as a handwriting note book in the portret mode. For scrolling I place the pen often at the lower site of the righthand scrollbar and move it up to scroll. Might it be that frequently starting the penpressure at the same place disturbs the digitizer or what. Very thankfull for response, especially from people with the same experience.