Working at Pontiac I have been under the hood of many G6'*. basically they are good cars. The only weak point is the power steering gear. If yours has the electronic steering assist you will have your rack and pinion replaced at least once due to a "clunk" noise when turning. The converts are sweet, though!
Id like the G6 better if they didn't castrate the production model so much. The concept G6 was a much more styled car. But as usual GM has been castrating many things these past few years and instead of creating something spectacular they stoop down to downright mediocre.