Bought an 07 LS coupe in May, this is my first new car and also my first GM car. Have to say I'm very pleased so far. Love the exterior looks, love the dash and interior layout, plenty of space for me and comfortable seats, excellent gas mileage (currently getting about 29.7 city), fun to drive, smooth ride, great features (automatic headlights, auxiliary audio jack, MP3 player), affordable, all in all a great car to own and drive.
Excellent gas mileage, automatic headlights, MP3 player, aux audio jack, comforable seats and well-positioned headrests.
Maybe slightly less cheap interior door handles and glove box, larger trunk entry would be nice, really that's about it.