I'm now on my 3rd replacement tx2522au unit, the previous units having been diagnosed by HP (including onsite visit by tech) and been declared DOA. All units display an issue with the digitiser. In tablet mode, there is a region on the right hand edge of the display, running from 3cm to 6cm from the top of the display and up to about about 20 pixels at its widest, where the digitiser pen can not operate. It's like a bubble on the right edge where the cursor is deflected away from, and this behaviour also occurs to a lesser extent in the same region, but further away from the edge. This means that it is difficult to pick up the scroll thumb or up scroll arrow with the digitiser. It also means that it isn't possible to close or select the settings of the second widget in the sidebar, for example. Whenever the digitiser is used in the vicinity of the area, the cursor is deflected considerably to the left of the pen. This means you can't draw anything approximating a straight line in the area. Calibration isn't very good over the rest of the display, but acceptable I think. While this isn't a showstopping issue, it isn't the behaviour I expect from a TabletPC. Even my very old NEC tablet has better calibration than this. Apart from my 3 units, many of the units I have seen at retail also exhibit the same behaviour, but I have also seen units that appear OK - and I'd prefer to own one of those! HP and their techs seem pretty clueless when it comes to this issue, for some reason troubleshooting required updating the video driver but not the Wacom digitiser driver :-( Can others here comment on their experience with this? And does anybody have knowledge of the tolerances that HP set for calibration? Thanks!