just make sure their arm lasers are all calibrated...
i went thru a car wash here in town and the stupid arm wasnt calibrated, they had put a new cover over the arm but somehow it caused the laser alignment to become wacked
long story short the arm got hung up on my passenger door mirror and sheared the shearbolt in the arm and when that happened the arm fell against the right fender putting a small dent in it...
i made the owner pay me the 65 bucks to have a paintless dent repair guy fix it...