Yeah, I just came from my 2nd demo of the new Audyssey outboard EQ today, at a speaker engineer's home. WOW! this thing is EASILY the most potent room correction/EQ on the market right now, period! This thing is a MUST HAVE for anyone serious about setting up superior home theater/audio systems.
While I've not yet been able to try one in my own system, nor compare it to other high end parametric EQ's (like Rives PARC, and TACT system's, which I'm familiar with), I must say, this thing does INFINITELY more than anything out there for the home market right now! It corrects for things that only extensive room acoustics and engineering, even equipment upgrades would only have fixed/adressed in the past. It appears to be a modern miracle of engineering for electronics/acoustics.
I'm surely going to delve much deeper into this matter, and see where my travels go with the Audyssey.
Right now, I'd pick the better sounding pre's on the market, and add the Audyssey!