All Audyssey implementations are also limited by the amount of DSP the OEM is willing to put in the device. Some high(er)-end products have lesser and limited versions because the OEM was not willing to pay for the hardware.
Also, since it is unlikely that trained Pro installers are available everywhere, Audyssey has seen fit to sell the Pro kit to end users, something that I would like to see made more common. I use the Pro kit and prefer that to having anyone come to my home every time I change something. Cost aside, of course.
(BTW, speaking only for me, the new add-ons for Audyssey are not of interest but others will differ.)
Kal