bikes and cars are the same here. Do you really think the mechanic will clean the inside of you tranny pan as well as you will? Do you think he's going to use a torque wrench on the bolts in a crossing pattern? Do you believe he will use a good quality filter? If so you may still have a tooth under your pillow.

 

I agree 100% Why should you pay for something they did, but then again I work in the automotive fleet industry and I see shop do stuff like this all the time and the clients have to pay. Shop's are crooks for the most part. I have the dealer do some stuff to my bikes, but I always change my own fluids.