I commute on one every day and just love the feel of the ride. As far as I know, the S10-S is the Special Road Racer. Early models had some Fuji gaspipe and later ones were cromoly, still later had butted cromoly. Mine is early gaspipe, but don't think that means low quality. This is gaspipe unlike any I have ever experienced, light and responsive. Mine has a lovely blue cromovelato finish, but I don't know if the S10-S always had that finish. One of the qualities of the bike that I like best is the wide stay and fork spacing, and lots of eyelets. It is dead easy to install fenders of a useful width. I just love this friggin bike and has no idea it might be my grail bike when I bought it. I vote you keep yours.