If for whatever reason your expecting to plug in some numbers from D-Nice and have your set turn into a Kuro or better then your going to be very disappointed. The THX settings are already close to what a properly tuned set will provide. You may get a little more brightness and some slightly different color but thats about it. If you are not happy with the PQ in THX Cinema you are not going to see enough difference in PQ to change your mind. From that stand-point, what are you expecting ? The GT50 is as good as any set I've ever seen and better than most.
I plugged Katz's numbers in late last night; the PQ is a little "different" than the THX Cinema but I don't think its really "better". If anything, I think I prefer the THX Cinema settings. That is just a very quick impression on OTA HD broadcast; I will have to give Katz's set-up a little more testing. I primarily wanted the set-up for the USB input since the THX Cinema mode isn't available.