After very minimal gains I pulled mine off and installed it on a '46 2A with EXTREMELY sloppy steering. It initially seemed to reduce play from 1/2 turn to rough 1/4 turn. I was about to take it for a test drive (and my first ever drive in that particular Jeep) but the clutch rod broke the first time I stepped on the pedal to put it in gear. New clutch rod on order. Will report back when I have more info.
Admittedly, I do feel a very slight but noticeable difference in the slop in my freshly rebuilt 3A steering box now that the Tightsteer is gone.