Dirac is the bomb, IMO. I love the flexibility of fine tuning the target curves and correction range and rapid a/b testing between curves. My ears love the results, compared to Audyssey (even xt32). Aside, from the great tunability, I think that their impulse response correction may work as advertised. I haven't verified that with measurements, though.
This has been the first time I have been really happy with EQ >400hz, and felt like it was a real improvement, not a step back.
I do prefer Audyssey XT32 with midrange comp disabled over nothing, but there do seem to be some trade offs. With Dirac, it seems like it's all good news, once you find the target curve and frequency ranges for correction that work best for your room.