I purchased my Civic used with 35,000 miles on it. I currently hit the 90,000 mark and had the Honda maintenance done, and it runs like its brand new. Haven't had any major problems, just typical wear and tear. Handling is great on the back roads around my house and don't even have to downshift to go up and down hills and around the S-turns. Great gas mileage, have made it to around 40-44 mph in daily driving (not highway). Definitely no complaints. Security features are FINE, car homes with a code that you punch in if the battery dies. Manual transmission is still shifting great and going strong. No problems with clutch, etc.
Exterior style, gas mileage!!, interior lighting and amenities (rear cupholder, secret center compartment, cruise control, moonroof (and moonroof button location... friends can't open it) interior design, tail lights, roominess (I'm a tall guy), no bump on back floor, can fit 3 people in back fine.
6 disc cd player, no other improvements needed... overall its a great car!