I’ve got 250 hours on my X2 and echo the sentiments expressed in this thread. More depth, realism, tighter imaging, richer sounding instrumentation, and for me, more punch in the 60-90 Hz range. I’ve also noticed orchestral selections are more natural sounding.
QRONO benefits may be individual/system dependent. What I like about it is the option to listen to the first 60 seconds of a track then switch the QRONO option on (which restarts the track) and take a 2nd listen. While some tracks sound improved, especially if they are sibilant in nature, most tracks sound less “live” and somewhat sterilized.

