The Lexus IS 350 is still more luxury than sports sedan. Straight-line performance is fantastic, and the automatic transmission is smooth. I am a tall/large guy and this car fits me well, due largely to a very adjustable driver's seat. The intake and exhaust notes could be more pronounced like on the BMW 3. The brakes and tires are high-performance versions (something tells me to compete better in comparos with the 3-series) and will wear out quickly, so be prepared to replace them often or get the less performance- oriented / higher-mileage substitutes. The body styling is wonderful, this car is truly curvy and beautiful.
The 3.5L engine is wonderfully powerful and eager to run. The ventilated seats are great for hot summers. Sunroof controls are easy to use.
The navigational system's touch screen functionality is severely crippled while moving, due to "liability concerns" by Lexus corporate. If you are a tech/navi geek you may prefer the other vehicle brands that don't treat you like a child while the car is moving. Also the back seats are very small.