I've put over 17,000 miles on my 2004 Aveo so far. As others have mentioned it is extremely peppy and has a surprising amount of interior room. I'm currently driving my Aveo 120+ miles per day including interstate, secondary roads, and city driving. And I'm averaging greater than 31 mpg. I love the small turing radius and the extremely responsive steering. I've owned several new cars in my lifetime and this is the first one that I've not had any problems with after prolonged ownership and driving. The quality has been excellent and I really don't know how you could expect more from a $12,000 dollar vehicle.
Initial acquisition cost; fuel economy; performance; and interior space.
Cruise control would be a nice option and a little more padding on the seats is desireable.