Have a friend with one in our group of mostly dirt bikes and rzr's. . including xp900's.
The Joyner is outdated, rattles has its problems. Don't understand why you want a real trans but I had I the choice like you do in AZ for a RZr to make street legal or a Joyner I'd pass the Joyner.
Heavy and underpowered.... Had a buddy buy one a couple years ago with the big motor (no Turbo) and it was a pig in the dunes. The transmission is poorly geared (too tall) for the dunes and you cant make any gear changes to it. He sold it and picked up a RZR and hasn't looked back.