Looks pretty normal to me, too. But as HarryT said, it's your decision in the end - use it as a reader for a couple of days, in your average reading condition.
Then, if you're not satisfied, go for an exchange. But if you expect something significantly more "perfect", then be prepared to exchange it many times, as others did (IMHO, some people are simply expecting too much or being overly critical - no offense intended, just my personal opinion).
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