If I understand this correctly, RLPhoto could have been referring to a buyer's remorse over a $1K once they come to grips with the 6D. At one point you are bound to feel the pangs of having an outdated AF system.
Well, all I can say it took me years to get to the limits of the 60d af system (and to be sure it's the camera's fault and not mine) - of course if using servo af a lot it's another story, but for general stills shooting the 6d af system might be outdated, but still perfectly usable. And we have to remember that the 5d3/1dx af has to be accompanied by the latest Canon lenses to really shine esp. concerning precision.
BTW Marsu42 ... Not everyone has your level of self-control, if I can call it that.
:-p you have to explain that one to me... but you managed to confuse me alright, which reminds me of one of my favorite quotes:
"If you can't convince them, confuse them." (Harry Truman)