I’ve got a 2023 gmc with 3.0. Had a transmission coolant line bust at 7500 miles. No other issues and have around 14,000 miles now. Had a 2014 gmc before with the 6 speed and it shifted hard from the day I bought it. It was a piece of junk. Do love how they look and ride. But I think the 10 speed transmission is the same as ford. Only time will tell on the transmission but do love the baby diesel. Great mileage even with a leveling kit and 35s