Just wanted to update with my opinion after testing with Dirac today. For me in my room it is a significant improvement. I could get similar full sound and bass out of dirac (used audyssey plus app before, with dirac I bumped the bass for Front left and right plus subwoofer) but the main difference for me are the details. The sound is more focused. So if you for instance listen to piano music, each key stroke is more on point, detailed and fuller. Same for guitar, just better on point and focused notes. Next to this things like the rain drops in the Amaze dolby demo, you van really hear individual drops with dirac.
It's not night and day as I obviously hear the notes and rain with Audyssey, but just not as detailed and focused. So for me a significant improvement, really happy with it!