I have the P55UT50 and I love it. I am considering buying another panasonic in a similar line. Perhaps just the P50U50 since I don't need 2 smart 3D tv's. Look like they are popping up at $600 or less.
I helped my parents pick out a tv while visiting them for Thanksgiving, they did not want a Plasma. They seemed to like the brightness of their LED, but it could not handle motiion in sports like the plasmas can. And the screens looked cloudy on the LEDs no matter how I calibrated it when compared to the plasmas. Luckily they can't tell, ignorance is bliss. They both have poor eyesite so I guess it works for them, I'll stick with plasmas for now.