This is my 2nd IS (had '03 IS 300) and I love it even more than my old one. The new IS feels much, much more expensive than my last one, and definitely more luxurious than other cars in its class. I think the car is gorgeous, and it stands out from all the boring cars on the road. I got mine a week ago in silver w/ black interior, and have already recieved so many compliments on the car. I especially love driving the car at night with the HID headlights and the Optitron gauges glowing that cool blue color. Lexus really went to bat with this one, and I couldn't be more pleased. If I had more money, I would've sprung for the 350, but I can't say that I'm really missing the extra horsepower :)
18" wheels, HID headlights w/ AFS, heated/ventilated seats, shark fin antenna, and "stock" stereo system (sounds pretty good to me!).