Changs is a 'no extra' high quality massage place.
That said, i have been hit up for extra by juliette after prostate massage which was not asked for, and not particularly good.
I feel for Shirley trying to find a good, reliable assistant but IMHO if Shirley is not available, Juliette is not a great substitute.
I would think there would be no end of beautiful young chinese girls that could learn the trade from Shirley and make good $ without taking their clothes off. Go figure.