When I bought the car I loved it. It was much better than the 1991 Si it replaced. Sadly my Si was plagued by many rattles and the dealer never could seem to duplicate them. Rattles seem to be a common problem with the '06 Civics. The car handles great, and makes good power from 6 - 8k. You have to work the 6 speed transmission when you're in traffic to keep the car in it's power band. The 7 speaker stereo is the best I've seen in a stock car. The Si is a good compromise between performance and economy.
7 speaker stereo, 6 speed transmission, excellent air conditioner, auto up/down driver window.