 I just traded an 04 for an 08. You can't believe how different the two are. The 08 has been elegantly refreshed with wood, heated steering, Bluetooth, Power rear seats, etc etc.  I didn't believe they could improve on the 04, which I thought was a great truck..but they did. The ride is far superior to the 04. The nav, DVD, XM, 20" wheels are all tremendous improvements.  We have driven them all... Escalade, Denali, Range Rover, Navigator - nothing holds a candle to this car.  