If you live in an area that has rough roads, make sure you test drive before buying - this car does not respond well to rough road surfaces. A lot of noise transfers to the cabin and the ride is harsh. This is due to the sport suspension. I had an '03 Type S before the '06 and do not remember the ride being as tight/harsh. Asside from ride quality on less than perfect roads, this car is perfect - great gas mileage, a lot of fun to drive and it holds its value very well. One other known issue among 05-06 RSX owners is the dash rattles when the temps go below 50. Once the car's interior warms up, the rattle goes away. These issues aside, I would purchase this car again.
Gas mileage, reliabilty, fun to drive.
Better ride quality on less-than-perfect roads. Better sub woofer for stereo - 8" Bose sub is not very good.