This. I was already a big fan of Audyssey, when I only had the XT version. I knew XT32 would be even better, but I didn't know how much better. To call it a "night-and-day" difference is an exaggeration, but not a huge one. The difference is definitely noticeable. The sound, from my speakers, in my room, became more smooth (less harsh, less bright), and more detailed and lifelike when I went to XT32 from XT.
I had upgraded speakers, from Paradigm's Monitor series, to the Studio series. It was a big improvement, especially for music. Still, with XT, I still found them just a little bright, and a little harsh with some upper mid-range frequencies. XT32 fixed those issues and now I feel like my speakers are playing to their true potential in my room.
Gear: Speakers (Paradigm Reference Studio Series): 40 v4 (front L/R), CC-690 v4 (centre), 20 v4 (surround L/R). PSA XS30 (subwoofer).
Denon AVR-X4000, Emotiva XPA-5, Samsung PN64F8500 (64" plasma), DarbeeVision Darblet DVP5000, PS4, PS3, Sony BDP-S6200,
Apple TV (3rd gen.), Harmony One, Sennheiser RS180