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Currently I'm also not totally convinced that the devices differ in the degree of brightness uniformity (some reporting strong effects, some reporting slight effects) but might just as well believe that solely the perception is different, whilst I have not seen multiple devices next to each other to be able to compare.

All I know is that I bought one Oasis and one Voyage and both had gradients, and I refuse to believe that I just incidentally caught 2 faulty devices while most others are ok.

Edit: Interesting enough I've just seen an amazon Voyage review from the 9th of May 2016 claiming that they were told that amazon (Germany) doesn't send out replacement devices anymore in general (only if the reason for the request is the gradient issue or not wasn't clear to me) as there were too many returns (but they could have their money back instead if they wanted)