I would schedule services with GM more often if it wasn't so inconvenient and didn't impede on my schedule. I refuse to use vacation time to book an appointment. Most of the time, I'm either doing the service myself or getting it done with companies that work outside of the regular 9 to 5. Shuttle services aren't regularly scheduled, so there's no guarantee if you'll be waiting 5 minutes or half an hour. This time wasn't too bad as I waited 15 minutes to be shuttled.