I also agree strongly, that your time, AJ, was not wasted. We have a very interesting discussion here, but by showing the Denon graphs, a somehow inconclusive result - imo.
If I may summarize, what I am thinking after reading all the arguments here and also looking at the graphs:
1. It only counts what you hear!
2. A single or MCH frequency graph/s do not tell you what you will hear
3. A presumably better looking graph cannot tell you if something sounds 'better' or 'different'
4. A graph can only tell you the obvious and is only one part of the whole story - in acoustics
Thus said, I can only say thank you again for your work! Keith included.
But personally, I would not rely too much on frequency graphs. Your measurements give me a good indication, which is not too surprising for me. But to draw the conclusion, that the Pro-Kit is a superfluous gadget, is not the right conclusion for me.
I understand very well, why you say so and it is plain because you don't hear a difference. I can hear a difference but I am using it in a non-treated room.
But what is also for me absolutely true: The differences are not breathtaking and the Pro-Kit is NOT a must have. For most people standard XT32 will do and this is also the intention of Audyssey.
And, if you have invested a lot of money in the acoustic treatment of your room, the Pro-Kit may not improve the sound quality. Whereas in a non-treated room it might show more effect. But this really depends on the room.
Whether you are spending the money for the Pro-Kit or not is your own decision and as it is with all things, some think it is not worth it and some think that it is worth it.
My personal opinion is that I am happy with it and it does for me what I expect.
And one more thing, in fact you should not use Audyssey. Instead you should invest thousands of Dollars in acoustic treatment, excellent speakers and electronics, if you can.