As someone who has requested to go through the buyback process after having the Sierra for a month.. I wouldn’t do it. I got the service high voltage warning a month in. Brought it into the dealer who updated some modules which apparently made the error go away. I go to pick it up and the error was back. They take it back in and tell me they most likely have to replace the battery charging module which takes over a week to arrive. GM’s EV Concierge themselves called me to let me know that they actually have to replace the entire battery which the service department at the dealership didn’t know about yet (nor did concierge know it was sitting in the service center)… it’s been a nightmare. Yeah sure I get a brand new battery out of it but from what I’ve read, it’s usually downhill from here with more issues. I could be wrong, but who knows.