They upcharge you, break your wires on your car and say they were bad (six months old), and charge you for injector cleaning when you had it by them 12K miles earlier.\r
If not warranty work for GM, go elsewhere. If it is an after-market warranty, search the orange guy off I-55 on 190 on the north side of 190. He does warranty work and also has it done the same day, not three days later.
Pros: Cashiers are very attractive and parts dept dude cool
Cons: Suckbutt service dept