Are aftermarket A body upper control arms worth it ?

Oh bullshit.

There was one control arm manufacturer that had failures, CAP. They only had a couple that anyone could actually show pictures of, and they had documented quality issues. Hell I had a set. They were bought out by QA1.

I’ve never heard of any other manufacturer, other than CAP, with control arm failures. MagnumForce had a couple of K frame failures early on, but I’ve heard nothing recently.

I’ve never heard of any QA1, Hotchkis, SPC, RMS, Firm Feel or honestly anyone other than CAP with control arm failures. It’s not a thing.

This was when I was building my dart. Maybe 10 years ago? Things have likely changed alot since then.
It was all over Fabo at the time. Heim joints was another issue.

Hotchkiss and many others were not available at the time
This is coming from memory and a bit foggy.