The title says it all: it is one smooth luxury sports sedan! After owning this vehicle for about three months now, it's easy to see why Lexus always gets such high marks in the luxury segment. My wife and I considered the 335i and the G37 sedan as well. Since we keep our cars on average about 8-10 years, we were uneasy about the 335's future reliability and high cost of maintenance and repairs. The G37 was superb, but definitely lagged in terms of interior finish behind the Lexus. The interior is beautifully crafted, and the vehicle lines flow seamlessly. The ride is taut, but not harsh. The vehicle has plenty of power for all but most demanding, and handling is very capable. It's a keeper!
Interior/exterior look, feel, and finish; power and responsiveness is terrific (but don't drive an IS-F before signing the papers on an IS350 - you'll keep looking back at the 'F'); Lexus customer service; DestinationAssist; ride quality; value and reliability.
On really long drives (drove it 750+ miles in one day), the ride can become harsh; rear seat access is difficult even for the limber ones; navi/audio locks you out of key functions when vehicles moves; interior plastics pick up smudges too easily; transmission can be more responsive; not an IS-F!