The set is great...in a bright lit environment, the only thing bothering me right now is the blacks in a completely dark room. They really seem grey instead of black. I had the 46" prior to this, and I don't remember being concerned by this. I'll try to test it out in a store to see what black levels I can get, to compare.
Anyways, right now i have the backlight set to minimum, brightness at 45, power save and light sensor both OFF (If I turned them on the image is too dim).