Plus-X was my favorite film when I was dabbling in the garage-dark room for several years in Alaska. Tried so many different films (in 35mm), but always kept coming back to it as my favorite for some reason. I think some earlier posters were correct - it is the way this film handles the highlights and gives "beautiful grain" not "ugly grain" like some other films, when enlarged beyond 10x if that makes sense. For 35mm shooting, this is somewhat important to me.
Always developed in D76 stock or 1:1. Maybe I'll have to give it a try in Xtol as well sometime? Great thread anyway; we need Kodak to know we love this film! :-)