Just had my 6r80 built with Exedy stage 2 clutches and steels and a billet input shaft by Brett Lasala, it's solid. don't get hung up on what you've heard. I've heard the 10r80 cant hold power like the 6r80 but I don't give it any credence. Mine was done through my tuners shop, they handled everything...I already bought the clutches and have been calling around local shops. I have heard terrible things about Brett. No way of ship of my tranny not knowing when I'd get it back.