I have the Panny you mention, and it too does have alignment issues. However, pretty much all the shop TVs of all makes I looked at did too. It seems that it's just pot luck with any model whether you get one that has no issues.
Other than geometry issues (which I still hope to resolve), I'm reasonably happy with the Panny. However, it took a few days to settle in (during which time I thought the picture was awful at times), and I had to fiddle about with the picture settings to get it how I like it.
See
50 or 100HZ and
Tell it to me straight (please!) - is this normal? for more comments from me about the set and the problems I have experienced with geometry.