Cobalt/G5 is a solid car.
The G5 is coupe only so a tiny bit sportier looking.
Opinions on the car not withstanding, it has generally been a reliable model. I'm not aware of any significant issues.
I don't think CR ever rated it a recommended buy, but I believe that was mostly for performance (or lack thereof).
Here is a link to the JD Power report on the 09 G5.
http://www.jdpower.com/autos/Pontiac...Coupe/ratings/
I double checked KBB and you are correct, it seems like a pretty good price.
Now as far as motivating your son to get his butt in class and move on to some education that will enable him to actually afford a nice car like this on his own someday.....................that is another discussion. So, yes, I think an 09 G5 is a pretty nice car when you are only making $8 an hour.