I've had no problems taking mine to dealer for updates, usually dropped off before work, courtsey ride to work, call them to pick me up after work and picked up with updated all fixed. Only had problem once with the MTF update, was on of 1st cars to do at dealership, they kept having issues during install, until they realised not to use WiFi for download's. Had to get a 'landline" for the computer in the service bay but by than near closing time for service so they gave me a loaner car, 2011 Mustang. Was pretty cool.. Overall really happy with C-Max and service from dealership...