Image Persistence On Late 2012 27" iMacs

Question

Hi.
I'm currently on my second late 2012, 27" iMac. I returned the first one I bought because of uneven color from top to bottom of the display, as well as a very readable image of my browser's address bar that seemed to not want to vanish from the display against a plain dark gray background every time I closed the browser. It was a persistent image after using the browser for only five minutes. It was pretty bad, and I exchanged the computer for a replacement.
The replacement model is much better. The colors are pretty even, and if I leave a web page open for a long time, the ghost image on the display generally takes about ten minutes to fade completely away, against the plain dark gray background that I've set as my desktop wallpaper. On my previous model, the image of the address bar never really left. It was, like... permanently burned in.
I've read an awful lot in these forums about image persistence, and also the help articles that Apple published on this site about it. I'm aware that Apple acknowledges this as normal behavior for their displays.
I still have a couple of days left, where I can return this replacement unit for another iMac, or get a refund. My question to the community is this: Is what I have now, as good as it gets? I'd hate to take this one back, and exchange it for another that's only the same, or possibly worse.
Mostly, I'm concerned about residual artifacts from desktop wallpapers, recently closed application windows, etc., interfering with accurate perception of, say, a photo that I open to edit or something. It's a little worrisome. I don't plan to use blank wallpaper forever, or wait ten or twenty minutes after browsing the web before proceeding to work on graphics.

Answer 1

Although I don't own a imac from reading these forums I'd have to say what you now have is as good as it gets. So that leaves 2 options.
Live with it.
Or return it for a refund and move on to some other mac computer or something else.