Bought my fully loaded Lexus IS250 with Xpack a few days ago. The driving characteristics of this car are wonderful. The same level of quality, comfort, and technology you would expect from Lexus with the added "pop" of a sportier car. I evaluated this car and a BMW 3-series and this won out easily - quality, ride, and efficiency. The BMW has better engine sound but you can add F-accessories to the IS if you really need the sound. Handling is better on the IS. Fuel economy is wonderful in the 25 range which is excellent for a spank'n new car and fairly aggressive driving. Smokey Granite Ext and Light Grey Int is a sharp look. I love the car will drive it for year
X-Package. The car holds the road really well. The modified suspension provides next to no body roll while still offering a nice "Lexus" ride. Definitely a difference when compared with the regular suspension.
None, Lexus builds a really nice car. I will probably get some all weather mats to keep the car looking nice and clean.