Chad calibrated my ZT60 last night and I'm very happy with the results.
He put a lot of effort first into understanding my typical viewing conditions, sources and material (and answering my questions on the setup possibilities). I think this was crucial in ending with the most useful settings for me. We chose a "day" setting with 2.2 gamma and high panel brightness for common viewing (blinds closed, but moderate levels of ambient light) and a "night"/"reference" setting with BT.1886 gamma and mid panel brightness for more critical viewing with only backlighting. 3D is a lower priority for me, but we chose TY-ER3D4MU (out of 3 different models I have) as the glasses to calibrate for.
The "day" setting was a nice surprise. I had never really considered that panel brightness high might be usable outside of very bright environments where the picture quality is already compromised. The standard THX bright room setting has awful colors, issues with gradients and a lot of dithering noise.
Chad's "day" setting is excellent. It is bright (not too bright, just right) and accurate. (I reserve the right to rave more about it after more viewing.)
The "reference" setting looked even better. I was initially concerned about the higher gamma, but I think it will be perfect. (Again, I reserve the right to rave more about it after more viewing.
I am very happy to have the choice between the modes, and having the "day" mode set for moderate ambient light instead of maximum possible output gives me a 2.2 gamma mode I can fall back to if BT.1886 doesn't give good results. I think this was a very good call by Chad and I'm glad he took the time to really figure out how my TV is used.
The 3D picture ended up being much more accurate than I thought would be possible with the glasses. Can't wait to try some 3D just to enjoy the new picture.
Chad worked a long day to get my TV up to his standards and the results speak for themselves. Not only are the measurements very good, he also made sure that the picture matches the nice numbers.
My old TV is a calibrated Kuro, so out of the box the ZT60 was a little frustrating. It has a great filter and black levels, it is clearly capable of very good picture quality, but the THX modes just looked wrong, and even the custom mode that I finally settled on had some issues. After Chad's calibration, the ZT60 is clearly an upgrade.
To sum up my experience: ZT60 should be calibrated. Chad and his calibration are excellent.