How could you get more descriptive than describing the difference between a Yugo and Porsche?
The precision in the machinery is un-matched currently by today's rep standards. There is a crispness to the feel of the edges of the gen crown. When threading it down onto the tube, it inspires so much more confidence that you are not worried about possibly striping the threads on the tube or in the crown. It's not so much a look thing, as it is a feel. Up close, you can usually tell the differences in the rep or the gen, but from a distance, does it really matter? Probably not. However, when you go to unscrew that crown to set the date or time, that's when you will notice the difference.
Try it out. When you get your watch, live with it for a while. Research the optional mods you can do to it. When you decide to upgrade the tube and crown (which you will eventually do), take special notice the first time you unscrew the crown.