I have had the trinnov mc on my crm4 and heard Dirac in the Rs20i at Genesis.
Both are stunning room correction systems. But without hearing dirac ( rs20i ) in my own room I will reserve my judgment.
But from what I did hear of Dirac. When switch on and off, well, the difference was massive. And the room was a proper dedicated, acoustically designed and built cinema room. Without Dirac the centre dialogue seemed muffled and everything just kind of mushy.
Engage dirac and speakers vanish, dialogue is crystal clear and the bass response, tightness and slam was very imprssive. But that is one area I really rate the trinnov, it bass ( sub ) handling abilities are just awesom. If I do not get an rs20i or a Trinnov MC I would get a trinnov st2 purely for sub control and eq alone. In a heart beat.
Wish I could have attended Cedia. But alas the UK show was canceled this year.