Just how good are they? this guy I used to work with has a g17 gen 1 and its at a price I just cant pass up for 200 bones the thing has minimal holster wear completely all original parts with the 2 original mags hasnt been shot in years about 400 rounds through it? is that a good price for a gen 1? are they just as durable? I know they changed to a bigger breach block in the other gens gimme some input help a brother out...