Can't help but to comment, we need service and they provide service, who's the customer? forum is for enthusiat to share knowlegde, help out each other not to get chop/con, to get to know good yet honest mech or to protect those with vested interested. You decide....
Pay bill, i think none of us have got any issue here when it is clean hosnestly done, labour.. yes but do charge what is appropriate, part.. same as above. After all, this is gonna be their business that earn them the living, service.. I would have expectation.