ProComp would be my dead-last choice among all the viable Jeep suspension lift manufacturers so far as I am concerned. And that's having been with ProComp's parent company where we had to push them. I'd look at Rubicon Express, Full-Traction, JKS, Currie, BDS, even Skyjacker or Rough Country (neither of which I'm a fan of) before I'd let anyone install a ProComp suspension lift onto my TJ.
Saint, welding of RE's long-arm kit is not required. It has sleeves for the frame control arm mount sleeves that can be tack-welded into place but they dont require welding... it's strictly optional. I have an RE long arm kit on my TJ and while I did weld those sleeves in, the instructions make it clear that doing so is optional.