Great price and great score Ray, half of what StewMac charges. Looks like it'll last a lifetime.
Funny, but in all the instruments that I've built & repaired, I've never used one.
Never needed it except once , I usually buy bulk fretwire & it comes on a spool, when I get it it's "pre radiused" in about a 14" circle.
I just cut it to length and undercut the edges, then tap it home.
Once I bought fretwire from StewMac when I needed some in a hurry, it came in straight 2 foot lengths.
So I just carefully arced each 2 ft. piece before cutting to length.
I can see the consistency & uniformity of using the tool though. Especially for the straight fret wire and older Fender boards with the tight 7.25" radius.