When I sold bikes back in the 70s, the people who bought mixtes were either (1) women who wanted to ride in skirts, or (2) people too short for a standard diamond frame. Group (2) people can now buy compact frames to get the extra stand-over clearance. There wasn't really a large market for mixtes. They were mostly sold to short women who had trouble fitting any other frame (shortest standard frame was 21", plus a few 19"). I do remember selling one mixte to a young boy who wasn't quite big enough for an adult bike otherwise. I bet he got teased riding it though. Technically, it's a good frame design, but a bit more metal and heavier than a comparable diamond frame. Personally, I shied away from anything girly, so I've never owned one.