I have the tint issue, and it has been getting much worse as of late. I just returned from the Sprint store, and was offered an M8 as replacement, apparently stock on the M7 is low and they are offering the new version instead of giving out another M7 that would most likely suffer the same fate. I was concerned about evenly exchanging for another phone due to others having poor luck with outright replacements having same issue return in short order. If you are having the Purple tint issue, have a go at visiting the main store in your area and see how you come out. In my experience, avoiding the non-Sprint owned stores may be a good idea, as the resellers have fewer options for replacing/repairing phones.