I had a 76 Chevy 3/4 ton re-arched by a spring shop in Boise in 1996. I only put a couple thousand miles a year on it, but it is still riding high. It rarely moves without a ton or more load on it.
That said, I agree you need to compare prices and look at how you will use it. I have no delusions that the used springs won't last as long as a new set, but at almost half the price on a truck I knew would sit empty most of the time, re-arching was the best deal for my truck.
