The sound is clearly superior from a technical point of view. I immediately noticed more air, speed, dynamics, soundstage, imaging, detail. I will update with more impressions in the coming days.
Glad you noticed the difference! I look forward to hearing your impressions, good or bad. More opinions the better.
Should I expect a burn-in process and changes in sound after a certain number of hours?
I've never experienced any burn in or sound changes with an IC op amp. Headphones and cables, maybe, but I've never noticed even a hint of change in an IC op amp.