I bought my G6 (non-GT) a few months ago now and wanted to express how pleased I am with my purchase. After much shopping and test driving every vehicle of this type (mid size, reasonably priced sedan) this was the first one that I was excited about after the test drive. It is fun to drive, looks good, feels good and the price was competitive. I have had no mechanical issues or other problems.
Sunroof, seating is snug and comfortable, fabric seating is attractive and seems durable (important with kids), acceleration is responsive and feels powerful and sporty. Very roomy in the rear seat, plenty of room for the kids. Folding rear seats has already proved useful.
Higher body styling toward the rear can restrict view while backing up but is fine while driving. Arm rest could be a bit closer to the cup holders.