A few weeks ago I bought a new pair of non-STF 501s, not knowing what I now know about STF, and raw denim (I thought STF = painted-on-tight 501s). After reading some of the stuff here I wanted to toss them and start over with STFs, but that got me thinking, what are the real differences? -Will there be any discernable difference in the cut/fit of a pair of STf 501s shrunk to me and my 501s? Which, I should add, I washed already (they got caked w/gypsum) and let dry on my legs. -Is there any difference in how the two pairs will age, fade and get lines? As I see it, if my 501s are made using the same fabric as 501xxs, just that mine were washed before they were made, then there is no real diffrence in fabric between my pair, and a pair of 501xxs that have been washed to facilitate the shrinking part of shrink-to-fit. -My only real problem with the 501s is that they're pretty loose in the seat, and I've hopefully just corrected that problem by soaking them in some warm water. Am I correct in these assumptions? Are regular 501s worthless? Should I toss them? What are the differences?