I have never used any AFCO products before so I can't really comment. Where are they made? If they are good high quality parts I don't see a problem.

Personally I use Howe 22320 upper control arm ball joints

http://howeracing.com/index.php/precision-ball-joint-screw-in-upper-fits-k772.html
Pricey yes, but the quality is all there and buttery smooth.
Howe is the same company that builds the TA2 Challengers

Best of all Made in USA