I purchased a replacement screen through iFixit almost a year ago. Yesterday, I opened my phone to remove dust behind my rear-facing camera and straighten my home button. Once I reassembled my phone, I noticed a small hair and dust particles when the image on the display was white. You can't see them with darker backgrounds but still an annoyance. I don't see how a fused display which had no dust behind it gets reassembled and has dust.
I just replaced mine on 10/6/13. WARNING: the black plastic spacer for the upper screw could come loose when taking the bracket off. Be very careful.