You're right that if the iMac I ordered (and should be receiving in the next 5 hours if UPS doesn't lie this time) has the same issue, I will not be able to stand it. I think I said that already, nothing new...
I am repeating myself, but out of my dozen LCD screens in the house, one has that issue and it drives me crazy, so no more....
I have got all generation iPhones and iMacs, a 2009 macbook pro and a 2008 iMac, I noticed bleeding on my iPad 2 when I first bought it and got it replaced right away, but other than that none of my devices has any bleeding.
You might be right that all new iMacs have that issue, I don't know, but if that's the case I have no problems admitting that it is a huge letdown.
I don't understand why you would even test the light bleeding in the first place to be honest. If you don't take it back after that amount of bleeding, I am not sure what was the point, it can't really get any worse than that... can it?
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I don't see the humor in it. It's sad that people are willing to accept any defect, just because they love the brand...
I love the brand, but I plan to work on these things 12 hours a day, so yes I will be extremely disappointed if that 2012 screen (which is supposed to be fabulous based on all the reviews) can't even match the quality of my 2009 Macbook Pro!
Let me address this:
First, the 2008 iMac, if it was a 20", was not IPS. So you probably wouldn't see any light bleed/bright patches. Second, your 2009 MacBook Pro wasn't IPS, so no bleed issue there. None of my iPhones have had light bleed that I can recall. My iPad 3 did, for sure, but my iPad 4 doesn't. Again, these are smaller panels which are easier to manage bleed on. I can absolutely promise you that your new iMac is going to have some sort of bleed. Take heed when I say a LOT of it is just poor black-level viewing angles, which washes out the sides of the screen (again, only noticeable on blacks).
Do you work on these things 12 hours a day in the dark? No? Then you'll be fine.
And are you seriously saying the 27" IPS panel can't even match the quality of your 2009 MacBook Pro? You do understand how utterly crap the MacBook Pro (non-retina) panels are, right? The 1440x900 15" display, and the 1280x800 13.3" displays are absolutely horrible, low-res, crappy TN panels. Period. The end.
But you've obviously decided what you need, so I really do suggest you prepare yourself for YOUR disappointment.