Well, I plan to vote with my dollars and go buy back that ZT60 I returned.
However, the unit I had, while pixel perfect and as quiet as I've ever heard a plasma, did suffer from two very faint vertical bands on the right edge of the screen. It was not visible at 75% white, nor at 100% white, but at 50% grey I can faintly make it out on a lower contrast picture setting, like standard with contrast turned down to 50% (I would use this for gaming or cable TV with static logos). It's barely visible in program material, but it's there and still a flaw. I checked my parent's two year old 50"U50 Panasonic low end plasma and it has a very similar case of banding on the right side only.
I asked about this banding earlier in the thread and someone mentioned it affected early production models. The ZT I returned had a production date of August 2013. Doesn't seem that early to me, sounds like a mid to late unit.
My question, again, is do they all have this band? I want to decide whether it's worth trying another new panel or if they all have it, then I'll go buy back my old one because it's quiet and no dead pixels.
It's similar to the following video I found online though the video flickers so much it's hard to see whether it's exactly the same thing.
video