I bought my 2004 EX 4 cyl., navi package brand new. I have been very happy with my purchase. I live in a walkable urban setting so I don't drive that much. I have 54K miles on the car. The only things I have done to it is have the oil/filter changed and fluids topped off (this is done for free every 7,000 miles by the dealer as part of the purchase) and the sunglass holder on the ceiling broke at around 50K miles so I had that replaced. The car didn't need to have any tweaks done when I bought it. There are still no squeaks or rattles. I have bought one new navi CD for it about 3 years ago so I will probably buy another CD next year.
XM Radio (never listen to AM or FM) is great and the NAVI system is very easy to use.
Door locks to lock automatically when the vehicle is put in drive.