I still run CAP lower control arms on my Challenger. Almost 30k miles on them now with no issues. I did run their UCA's as well, although I have swapped those out for Hotchkis UCA's now. Part of that was for piece of mind, the other was that they didn't clear my 17x9's.
The design of the CAP parts was not the problem, their welding and quality control was. So, if you have a set of their parts, inspect the welds, to do it right means stripping the powdercoating. If the welds are up to par, you shouldn't have any issues. If the welds look cold, toss 'em.
I would guess that QA1 buying them out will fix the quality control issues. However, I don't know how many parts Mancini carried in stock, so I imagine it might still be possible to get CAP fabricated parts.