We run OBX arms on our car too. They seem pretty soild, but you REALLY have to watch what you leave for thread engagement where the heims meet the arms themselves. They are LOUD too. Just a warning.
That being said, ours get the **** kicked out of them on a regular basis, huge ruts, bumps, and the occasional instance of airborn-ness lol. They havent failed yet. Keep them clean and lubed, and they are fine.
OH, the only issue I had with them was the cam bolt for toe in the rear. It broke, and no longer acted as a cam. Minor.