Manners... Even my friends can be complete jerks because they don't think about what they're doing, they just do it.
So how are you in your buying process? Looked at any cars yet?
What I noticed when driving cars: You can feel quite a difference between Legacies and Imprezas. My Impreza was more fun to drive than the legacies I drove (2000 GT sedan, 2006/7 Outback, and a 2006/7 sedan).
You can also tell when a car has been beat on. I drove an outback sport (meaning impreza-based) wagon from '04 and saw that it had aftermarket fogs bolted on. At first, I thought cool, but then I noticed how poorly they were aimed, and they were bolted directly to the bumper cover (so they were wobbly). The car handled ok, but the engine just felt... old and used.