One of the most important things is the reasonable gas mileage.
The matrix has been good to us so far, but I am not used to such a low profile car. I have hit curbs because I am unable to see them. So far, it gets decent gas mileage and has been reliable. The back seats easily fold down making room for larger objects. People who have driven with us have said the back seat is spacious. We have had trouble with our CD player. It continues to read error or say there is a CD in place were there is not so it does not accept another CD. We use our AUX cable to listen to music on our phone or have a movie playing during distance driving. Lastly, when driving distances, it is very noisy inside the car. It makes having a conversation or listening to the radio quite difficult. We sometimes have a movie playing, but incredibly hard to hear even on maximum volume on the device and car.