I didn't know much about the Cobalt before looking at it, but I read up on reviews and such. Basically it sounded like a reliable car because it's an updated version of the Cavalier, so it didn't seem like a gamble of a first model car since it's an update on another model. Overall I really like the Cobalt LS coupe. It's reliable and seems like it's going to last for a good amount of time. The design is nice but could use a little updating to compete better with foreign cars. Only general complaints are the bad blind spots due to small rear windows and poor interior lighting and the fairly cheap plastic interior.
Oil system, sporty look, Pioneer sound system has deep rich sound, decent gas mileage, large amount of trunk space, and pretty fun to drive.
Dome light (the lights under the rear view mirror are nice but not always practical) increased size of rear windows to decrease the dangerous blind spots (i feel like I'm guessing when changing lanes) Rear window wiper, wider opening to trunk, lights in vanity, and a lock on glove compartment.