cs123 -
We do not fly with a particular CSM, though we have a ground manager (the person you would call your boss or supervisor in a regular job). These managers just had their workload greatly increased and look after 250 flight attendants each. I have found the two in my base to be very good. Though they seem to have little authority and always have to send emails or make phone calls to get things done.
Our CSMs regularly do behavioural type appraisals and these are fed into a computer system, which our manager can access. We used to sit with our ground manager and they would go through them. It has been a while since that occurred (2006 was my last).
I have, however, received complimentary feedback from customers that appears to come from the the customer feedback webpage. It is de-identified though and is attached to a letter from our manager.