Personally never seen this. I only upgraded mine because it came as a set from Resz Fab (now out of business). I was only looking to upgrade my lowers since those tend to bend when wheeling. Their price for the poly set was great but their customer service and lead times were TERRIBLE. Sonoran Steel even suggests just to upgrade the bushings on the stock uppers rather than buying aftermarket ones.

If I were to do it all over again, i probably go with either Dobinson (they also have offset uppers) or Metaltech (proven).

I regularly check the bolts on my suspension because on several occasions I have found them to come loose, including the uppers. I assume it would be safe to drive short distances but I personally wouldn’t risk it with it completely sheared…