So I just got round to playing with the SpyderX Pro and my AW2721D, can't say if it's changed much yet as need to do my usual activities (work, browsing, videos, gaming) to really test it. Only noticeable difference right now is brightness is down from the 85% I had it set to.
I tried initially using the Datacolor software, which during the calibration process asked me to decrease the brightness using the OSD to 37% from factory setting (in a dark'ish room, only large lamp on in the corner and TV otherside of the room). I then tried calibrating with DisplayCal and it didn't request me to change any OSD settings, just applied an icc colour profile so Brightness is back to factory setting (50%).
I would've thought both pieces of software would have me tweak with the OSD settings more, but I am a novice at this so perhaps not if it is all software based.
Did you have a similar experience
@Greebo ?