I just had Chad B here to calibrate my 844. Many people have noted that this set will never render colors 100% accurately, and mine was no different. After many hours of trying different settings that I had found online and going through my DVE disc over and over, I finally took the plunge and brought in an expert.
Sure enough, his measurements revealed that my white balance and color accuracy was pretty far off. After about an hour of set-up and 2-3 hours of work, Chad had brought my set MUCH closer to the ideal. He did a full calibration for an ISF night and day mode, as well as a 3D mode, and did a quick adjustment of game mode to correct the colors. This display has some inherent issues that are not really fixable, but Chad made some huge improvements to the white balance, Gamut, and color accuracy across the board. The first thing he did after checking the test patterns and reference images was turn on ESPN . . . I was pretty shocked at how much smoother, deeper, and more natural the picture looked. That was the case for pretty much every HD channel, regardless of the signal quality. The difference was pretty impressive. Blu-ray through my PS3 showed a similar improvement, but I've only watched a couple scenes from TDKR and some concert blurays so far (he literally JUST left). I'll definitely be spending more time with it this week, re-watching some of my favorite blurays.
Chad was on-time to the minute and very friendly, explaining things to me every step of the way, and making sure to get everything right before moving on. He spent some time on my audio system as well, helping to improve speaker placement, re-doing the Audessy calibration, and tweaking the sub levels a bit . . . it wasn't the full Audessy Pro calibration, but it brought the sound to life and smoothed out the bass response in my room quite a bit. I'll be stepping up to an Audessy Pro capable receiver in the near future, and I'll probably have him back to set that up as well.
I've had mixed feelings about the IQ of this set since I bought it, but I think I"ll be pretty happy with it now.