if you buy one of these out of warranty you're gonna wanna put about $4,000 in a safe for that rainy day when your head gaskets or cylinder heads fail you. You're also going to want to set aside $150 semiannually for replacement of the front door Bose subwoofers. And you're going to want to put aside $70 weekly for gas because the car breathes it in. You're going to wonder why your engine shuts off at a stoplight the day after a rainy day. You're going to want to put your hazards on so the hasty driver behind you won't beep their horn when the light turns green after yours shuts off. You're going to want to change that dexcool annually, forget what the manual says. Three years later you're going to wonder why you bought it.
It's not the subpar stock Goodyears, it's not the subpar subwoofers, it's not the unreliable pre-2004 4.6L, it's not the Cadillac dealer. If I had to pick any features that I don't dislike it'd be the Bose system (which is very crisp) and the exterior (which is awesome).
Ummm, maybe either an all aluminum engine or an all cast iron engine. The 4.6L has a cast iron block and an aluminum head, both materials have different expansion rates paving the way for blown gaskets or cracked heads. I tip my hat to Caddy for the post-2004 models, poor quality. Buy a Lexus.