I just got those yesterday.. If my car throws a CEL, I'll check it myself to see what trouble code it is - I have an OBDII reader and the workshop manual, so I can get more info than just the reader tells me.
That's somewhat irrelevant I guess; I hate bringing my car to the dealer. Last time it was there was for the engine mount recall, and they broke a part of my battery cover. In addition, they went ahead and denied that they broke it. I know it's probably a $20 part that I can replace in 10 minutes, but I took the battery out twice and never broke anything! Motherfathers.
The service adviser I usually deal with at Partyka Chevy-Mazda is very friendly, but dealer service, yuk. I can do most of my own maintenance, and that which I can't do myself I'll pay Steve @ Automasters to do.
Sidenote: Anyone in the Meriden-Wallingford area of CT, I highly recommend Automasters in Meriden for any routine service. Steve is a highly skilled mechanic and will NOT mess your car up, even if some find him to be a grouch. I guess he's a grouch if you work for him; my brother worked there for a few years..