My iPhone 7+ is legit out of the box. I don't hear any hissing. How do u get the hissing and what's the nature of it? My screen is "warmer" than my 6s+ when I put it side by side. But in certain angles the colors are crisper so u win some u lose some. I think it boils down to preference, do I wish it's cooler color like the 6s+, yes. Is there some thing wron with this series with a warmer tone? No. I'd rather stick with this one than be anal retentive and get something else with worse problem.