My guess is it'll be a personal thing where for a percentage of people it'll be fine for daily use, for another percentage it'll be tiring, and then for a final smaller percentage it'll be truly awful and cause migraines or whatever. Also I have yet to see much talk about how this will work for people with abnormal/poor vision (e.g. abnormal pupils or sclera, vision only in one eye, etc.). Although I do think Apple has a good track record for accessibility?

There's no way know until many thousands of people are using this device how those percentages will pan out.