We only just bought our HHR after trading in our Chrysler Town and Country Van which I was very attached to, but we no longer need a vehicle that size. I love the HHR, it is so comfortable and fun to drive. I love the interior and the way all the gauges are set up. I was going to go with a tiny car for better gas mileage but the HHR gives me a bit more room with a better gas mileage than my van.
I love the old body style and all the interior controls are very convenient once you get used to them. I really love that I have the buttons on the steering wheel to adjust sound and tracks for the Stereo. It is also very convenient that my back seats fold down in case I need to haul something.
i can think of no improvements at this time but I just bought mine so maybe I will think of something later on, for now I love my HHR.
† Edmunds.com received the highest numerical score in the proprietary J.D. Power 2014 Third-Party Automotive Website Evaluation Study℠. Results based on responses from 3,381 responses, measuring 14 companies and measures third-party automotive website usefulness among new and used vehicle shoppers. Proprietary study results are based on experiences and perceptions of owners surveyed from January 2014. Your experiences may vary. Visit jdpower.com.