Traded in my Audi A4 for the Altima Hybrid. It's as comfortable, as quiet, as loaded with features, as beautiful... and I get 42 mpg on my 75 mile commute instead of 29 mpg on the Audi. I just set the cruise control to 65, ease up on the pedal around town, and the car does its magic. Add the regular gas instead of premium, and the $2500 tax credit, and I'm saving a lot of money. OK, I give up something on zip and handling, but I definitely gain something just knowing I'm not spending all that money on gas and supporting the dictators who run most of the oil producing countries... plus having a hybrid has a certain cache that makes up for the loss of the luxury car nameplate.
Mileage! Very comfortable and quiet.
The nav system and systems touchscreen are not at all intuitive. Could stand some redesign.