I am on my fourth iPad. The left backlight died on the first one on day 14, which was annoying because the screen was great with no dust, dead pixels or tint issues. The following three were all brown box exchanges. The second one had dust under the screen. The third one had the pink/blue tint issue.
The first two exchanges were easy, no questions asked. This last one the Apple store employee treated me terribly and acted like she was doing me a huge favor. She was condescending and told me that not even $5K screens are perfect.
I was offered one more and I stood there debating between the two, one with tint issues and one with a dead pixel. I took the one with the dead pixel since it was in the lower right corner of the screen. Much less noticeable then the color issue and one of the reasons I upgraded from my first gen iPad was to use iPhoto. Also, I figured a dead pixel is a real defect, rather than a subjective one like the tint of the screen. Of course, on this screen, a single dead pixel is still smaller than the dust that was under the glass in the middle of the screen of my second one.
She said she was making a note stating that I wasn't allowed to return this one. While I love my Apple products, this experience has left me concerned with buying future products.
I understand that I might be hard to please, but I intended to keep the first one and use it for a long time. I guess it was too much to ask for a replacement that was of equal quality. They seem to hand pick the display models, so you would think they might have a few hand picked ones for difficult customers like me so that they can leave happy with a single exchange.
Ok, done ranting for tonight.