FEDEX safely delivered my Week 51 iMac I7 this evening. The shipping box was in good shape, as was the apple box inside. I held my breath and unpacked the unit and set it up on my desk. No cracks on the screen cover...whew. So far, I've "migrated" my previous iMac onto this one without issues. Mine has a WD1001FALS, rev. 20.404F20. I literally cannot hear it, and I have perfect hearing and perfect pitch. So far, so good. Apple updates found a few, but not the so-called fix for the stuttering screen. So, perhaps it was preloaded before the machine left the factory? So far, no stutters, but the machine has only been on for 45 minutes. I also set a pretty pure white screen background. If there is a yellow tinge, it seems to be concentrated in a straight line across the bottommost 1/8" of the screen. Hardly noticeable. Well, we'll see. what happens. Hopefully yours, Moi. P.S. Just ran that on-line grey test one of the sites has. Both sets look the same. What's the test to test for screen flicker? Patience?