It is case by case and depends on A) the store and B) how you interact with people. I went through several X last year and just to be safe either confirmed everything with a genius or one of the managers. I'm generally friendly and engaging and explained my issues in detail to them. I even tell them to please stop me from exchanging / buying again if you feel I am abusing any policy. Each time they tell me it isn't a problem at all. Who knows what they put in their notes, but I've never had a problem.
But, I don't want to be "that guy." Bought two XS, returned the 2nd one. Despite my annoyance with very narrow sweet spot compared to perfect display models, will in all likelihood keep my first XS. It is warm but it is accurate. Up next to my monitor calibrated with ColorMunki Display and DisplayCAL to 6500K, the XS is identical to the monitor. Blacked out work-related bookmarks on Chrome bar. But you get the idea. Warm display is accurate, you have to get used to it.
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