I had my TC-P65S2 for a year before selling it and the black levels were still great. The thing that drove me to sell that was the fluctuating blacks -- ugh, and get the VT30
The Black levels on the VT30 are a little better, and the with no fluctuating blacks or brightness, it's a solid tv with great black levels (65VT30). I haven't noticed any change in black levels, day, night (no lights on in the room).
I think paranoia has a good deal to do with SOME peoples' perception of black levels or poor image on a tv of any type -- the more you read, the more you look for. Sometimes, ignorance is bliss.
11.2: Marantz 8802a; Parasound A51; Parasound 1250; Oppo BDP93; AppleTV; Harmony Hub; Paradigm Prestige 95F fronts and center; Martin Logan Descent-i; Prestige 2000sw; 4x SA-ADP paradigm in walls surrounds; 4x paradigm ceilings, angled; audio quest interconnects; furman power; Panasonic P65-ZT60; xfinity x1; custom home theater room in basement.