We have the 3.5L dual turbo and love the power and feel of this car. It's a solid beast of a ride that drives exceptionally well on snow and ice covered roads (with snow tires of course).
This car is a bit of a sleeper car. Doesn't look like it would have much under the hood, but it surely does impress on straight stretches. It's designed for comfort. Not so good for tight cornering, but fun nonetheless. I've actually considered taking it to a track to see what it can do.
It is solid and therefore relatively heavy vehicle for today's world. Not the most fuel efficient vehicle, but not horrible either (considering it has 365HP). If you don't drive like a maniac, you will be fine.