I've only owned it a week and I love it. I formally had a Bonneville and I loved that also. There is a lot of head room in the G6, more even than in the Bonniville. Gas mileage is better and it is a smooth riding car. I had my son and son-in-law in the car with me and they are both over 6 feet, they said there was plenty of room.
The accessability to satelite radio, if I would like and also remore start
Like I said I have only owned it a week, right now nothing to improve.