To pass some time during my lunch break today I took a stroll into the West 14th Street Apple Store in New York and "examined" each and every 27" that was on display (they were the base 27" with the 755m). I was the weirdo with a white Safari window moving it all around every corner of the screen staring really close - then repeating it on every 27" iMac

. Other than being a bit dirty, they all looked totally fine to me. Not sure if this helps!