I have been most impressed with the gang in Chicago. I had a period in 2002 where I dropped to E before requalifying SE during the year.
On day trips to Chicago I was still met in the morning with a friendly smile and my boarding pass for the evening. They also usually included the list of the flights for the evening and the load factors in case I wanted to change flights.
The ORD gang will help me out even when I'm not flying anywhere near them.