I'm going to check out the demo at costco and BB this weekend. I tend to be more skeptical than my friends especially of manufacturer demos designed to sell televisions (which they trust w/o question) and in general less easily impressed than they are so I suspect my impressions won't be quite as earth shatteringly favorable. Especially from six or more feet back from the screen. That said I'm sure I'll probably end up with one sooner or later as I do use my panel for HTPC, desktop, gaming, etc. and the additional resolution is a plus there.
I like the test experiment that was in the link a few posts up because it provides a side by side blind test.