I purchased a 2005 Impala after being T- boned in my 2003 Impala last month. The safety rating was the determining factor in 2003, and it proved to be correct. While the car was totalled, I was not hurt, and the 3 carseats in the back were untouched. The car is extremely comfortable, roomy and fuel efficient. It handles nicely, and above all, it is built to protect passengers in the case of a crash.
Safety and space. The trunk is exceptional, and there is ample room for three-across cars in the back.