I only got the base model, but this is a great sporty economy car, not an economy sports car -- there is a difference. It handles well and is fun to drive. I haven't opened it up yet, but heard from another Cobalt driver that highway speeds close to 100 miles are easily attainable. Not bad for a 2.2L motor. I've had a number of comments like, "sharp car" in the weeks I've owned it.
Looks. Price. Handling. Drivers foot rest. Up/Down adjustable drivers seat.
At 6'1", when I have the drivers seat raised, I can't lower the steering wheel without partially blocking the view of the speedometer, gas gauge and tach. The info center buttons are also blocked all the time(not a big deal). Too much plastic (even in the LS model) makes for irritating noises.