About 1/3 of the screen had a yellow/brown tint to it. Seems I'm not the only one with that problem but I don't know how widespread it is. Apple probably got a bad batch of panels.
Just got my replacement today. Won't know till this evening. And didn't check the manufacturer on the first unit that came. I went with the 750. I hope it is a Seagate as that's all I buy.
I don't think I'll ever buy another WD hard drive again. I've owned two and both failed - one after 3 years and the other after 11 months. I think I'll stick to Seagates as well.