I went from an Onkyo with Audyssey XT32 to an Anthem MRX-1120 with ARC.
Audyssey seemed to yield wildly different results every time I ran it, even when being really accurate with mic placement consistency, etc. Some times I liked it, some times I would just start over after getting a "blah" sound correction. It was good and I gave it a lot of favorable feedback, but when I went to ARC.... WOOOOOW. So much better. More impact, more clarity, just nice clean sound. That is both with and without Atmos speakers.
