Reps are reps, assembled randomly from bins populated with random parts.
Rep dials and hands (finish and lume, etc), case and bracelet finish, movement reliability all suck when compared to gen.
I say this from experience owning both. Bracelets and straps present the most obvious quality distinction in my experience.
What should one expect when paying 1/10 or 1/30 the retail price of the gen?
I get that gens are jewelry, sold with corresponding profit margins. Gens have QC issues, too, but are more easily resolved in my experience. I live in a major metropolitan area and can't find rep-friendly watch smith.
Gens FTW, IMHO.