I've heard it said, but no documentation, that re-arched springs to not hold up well for long period of time..... but of course companys want to sell you shelf of regular production stuff........just saying.
No reason why re-arched springs would perform any differently than original. The metallurgy isn't changed. They did get into the yield range when re-arched, but not enough to affect the fatigue life of the base metal. If they were re-arched multiple times (like 100), then it might be a different story. That statement is a marketing ploy, IMO.
