ComEd's real hit & miss. I have had great experiences and teribble ones. I think partly it depends on what happens to be going on at the time (how busy they are), as well as what area you are in. There is one guy (Lineman) I have delt with a couple of times that has his priorities a little messed up:
1. screw with you and your day.
2. do his job.

But I will say my brother had his tail put between his legs learning a lesson about cheap meters. He went back and forth with ComEd because he was reading 233, 234, and 256 at my uncle's wood shop. Had ComEd out twice insisting something was wrong. Met the guys out there and I think they went easy on him.

He's got a real nice Fluke now.