I've really enjoyed my Impala; both my wife and I enjoy it more than her Maxima. I've had no problems until recently which include the cruise control turning itself off and at the same time interior fan will stop for a brief moment. I've enjoyed the car so much I've considered trading my wife's Maxima in on a another Impala (her Maxima has surprisingly a number of problems). Mine is the LS w/o leather or the sunroof.
The seats, smooth ride, big trunk and I average 31 MPG out of the 3.8 (mostly freeway driving). Good sound out of the premium stereo.
It appears you can only get the compass and outside temperature gauge as part of package which includes a sunroof and leather(for my year). I do wish the brakes would stop a little quicker.