I love my G6! I've had it for 5 years now. It's at 75,000 miles and has not had any major problems whatsoever! The styling is beautiful, both inside and out! My only minor complaints about the interior are that the leather is fading a bit on the left-side edge of the driver's seat (I must sit extra hard on that side) and some of coloring on the radio dials is starting to fade just a tad. Mechanically speaking, it's been a great car! Lately, I've had an odd sound when braking, got it fixed before brake pads were adjusted or something, but now the noise has returned. But it's apparently no cause for concern. Despite these minor flaws, though, it's been a great car and is very fun to drive!
Reliability, Beautiful exterior and interior styling, 6-disc CD player, Sun roof, Auto headlights (why don't all companies make this standard equipment like GM?), Radio / dashboard display, which gives the owner lots of useful information like MPG, estimated miles 'til next refill, temperature, etc.