I have Moog ball joints on for about 16K miles and 3 1/2 years and I'm going to replace them. Why? Because I am having a memory steer issue that I can trace back to the ball joints. They are simply too stiff and never "broke in" properly. I hate the idea of spending $350 on ball joints and seals (again) but the memory steer is significant enough that I have to do something about it.
The replacement ball joints will not be Moog. I thought about using Raybestos but I am going with the Motorcraft ball joints and seals kit from PartsGuyEd.