That really is an interesting site.
Of all of the macs I have ever bought (30+?) -- NONE of them have ever had issues that have warranted a return or repair. amazing how many there are for the 27".
I yes, I have bought several refurbs and Rev A versions.
I had had the same experience as you, which is why I ordered a 27" i7 iMac with confidence. I'm talking real rev A products like the first MBP and a day-one iPhone.
Unfortunately, I've had to return three so far and have a forth on the way. Maybe my luck just caught up with my, but I do think the iMac screen problems are more than the normal glitches.
Here's hoping the forth times the charm....