I have had my sonata since July 2011.
It has been great to me.
I do a lot of business travel and I am averaging no less than 38MPG on almost all my full tanks of gas 530-575 Miles between fill ups.
It has a very smooth ride and I have had no operation or performance issues.
The interior design.
Everything about the navigation, audio system and the layout of the car is beautiful!
I also love the LED accents on the headlights.
Would have been nice to have the 42-44 MPG that they first advertised, but they made good with the annual rebate!