Input shaft (worm gear) play

I did a bunch of research on rebuilt power steering boxes when I was considering replacing mine. From what I could learn, most of the rebuilds just replace seals and a few internal parts put them back together. The gears and hard parts not available as replacements. This means that that you get what you get, maybe good, maybe bad. The only exception seems to be Firm Feel or Steer and Gear. All the reviews seem to indicate that they do it right, but the cost is much higher.