Just crossed the 2year ownership mark of my 2018 Volt. Has 50,000km on it during winters only, of which about 40,000km have been electric. It would have much more mileage, but once bikes started being allowed in the HOV lanes, I park the car in April and ride the bike about 40,000km til December. The Volt has been a great car and a pleasure to drive in the snow and ice. First car or GM vehicle I've owned brand new.
Last winter, the front end was hit lightly by someone in a parking lot causing minor damage - a cracked headlight & some plastics. I didn't notice it at the time because the car was so dirty, but water/salt got in and created some issues to the wiring harness over a few months. It caused an error reading with the battery, so I took the car in. Dealership said it clearly wasn't a warranty issue, so they were not responsible for the cost of the repair (over $2k). I agreed and told them to go ahead with the work. They said they could have the parts ordered and the work completed in 2 days. They gave me a brand new loaner pick-up truck for the 2 days.
When I went to pick up the car, the service manager said he figured out a way to assign most of the repair to my warranty and they would now cover the cost of the harness/wiring work if I covered the cost of the plastics and some other labour ($700). Not many dealerships would do that. I've also had 2 preventative oil changes which were also free - one at 24k and the other at 48k, even though I didn't need the changes due to such low gas usage. Great dealership experience so far and this car has exceeded my expectations.
PS: Thanks to everyone in this thread who contributes meaningful knowledge - helped a lot in choosing this car! Our last 4 Honda vehicles have been nice cars, but exceptionally poor dealership experiences for myself, my wife and her Mom. My Volt bumper has not yet fallen off and even if it did, I can rest easy knowing that it would be fixed within 2 days. My next vehicle will be full electric and my wife will take the Volt since she likes it too.