The AMS Bike Co-op/Bike Kitchen at UBC in Vancouver use CiviCRM. We hired developer/consultant people (specializing in CiviCRM) to do some of the work for us. We found that while it's good and works, it's definitely overkill for our organization. Also the developers we hired are used to dealing with huge non-profits, so we were low-priority clients and they didn't really understand our needs. I was never involved in actually *using* the CiviCRM system though, so maybe a staff or volunteer can add to/contradict what I said. ^_^
HUB Cycling (formerly Vancouver Area Cycling Coalition) also uses CiviCRM for their member+volunteer management.