You Midas well leave them your wallet and first born son.
I had the misfortune of having a problem while on vacation nearby, and suffering a breakdown. They quoted me a repair of about $3500. Very nice. They knew they had me. On vacation, twin toddlers, and 4 other kids. I ultimately took it to an independently owned shop, and they fixed me up for about $900.00.
It is my opinion that if they think they can juice you, they will. Beware!