Great bunch of posts on this subject. Looks like I'll be installing mine, My 51 half ton has only "Armstrong" power steering so it'll be nice to get a little more leverage for slow speed tight spots.
I liked the vintage look cheesecake ones on e bay but this one's even more special for me as it belonged to my father and I just recently unearthed it out of his junk pile, that and the fact that I've kept the old patina on the trucks finish and this knob has just the right amount of that to match up to it.
-Mike-