I like the retro look of the HHR, not many cars out there other than the PT Cruiser in its class.
I have driven this car over 14,000 miles in less than a year and I have not had to take it back to the dealer for any repairs.
The interior is comfortable and seems to be put together well, add leather and it changes the looks to a more expensive vehicle. All controls are within easy reach. Window switches in the center console are the exception.
My HHR has 2.4 liter engine that performs well. It will cruise at 70+ MPH with out any problems.
I bought this car for my commute to work and have not been disappointed. In 50/50 driving, I am averaging between 25 and 27 miles per gallon. On a 300 mile trip I averaged 29.5 mpg with 4 people, luggage and running well over the posted speed limit.