This is my 3rd Cadillac, and my second STS. The new design definitely tops my former Seville STS. It is a very fun car to drive, and has lots of power at any speed, without using Sport/Manual mode. Sure there are things I would change and things that aren't fantastic (like any car), but the good makes those easy to overlook. The styling with traditional Cadillac cues is a win for me, and I love all the bells and whistles - after all, this is a Cadillac. I feel great driving it, a very responsive car - it is difficult to find performance and luxury in the same package, but this is an example of it.
Keyless access, ventilated seats, auto exit seat/steering column, heated steering wheel, the quality of the upgraded leather option, led brake lights with the traditional center bar, lots of customization available in the config menu, auto door locking and arming as you walk away from the parked car
Did not like the grill on the 06 (plastic-resolved in future years), the level of plastic inside vs. padded/leather, rear a/c controls should be automatic, needs more rear leg room, the ride is a little stiff for a Cadillac even in touring mode, suggest trunk springs open for easy access