I had heard great things about Dirac, but had never really considered it for myself before. This post makes me want to look into it. If the difference is that clear, it makes it hard not to.... the RS20i has yet to be fully integrated. I had one in my room about a year ago and the improvement over the Marantz (actually 90% of the improvement was Dirac over Audyssey)was incredible. Better everything: bass, midrange, envelopment.