Mercury Sable is a very refined vehicle. It is well designed and well built. I have had no initial quality issues which is a first for me. For a large sedan, it has great visibility and feels much smaller when driving. It has lots of room in both front and rear seats. Trunk is huge! Controls are logical and easy to use. Stock sound system is pretty good and has a aux input for portable electronics like mp3 players.
Seat comfort, ride, initial quality. Performance is very good for a family sedan. Handling is actally surprisingly good.
Needs telescopic steering wheel and pull down handle on trunk. The ability to shift the transmission manually would make performance better. Better gas mileage would be good but for its size, it is OK.