I love my sc430. I bought this vehicle about six months ago with 72K miles from an independent dealership. This Lexus is not as fast as some sports cars, but the luxurious interior, unique exterior, comfortable seats, and retractable hardtop makes up for any shortcomings. I changed the runflats to grand touring "Platinum Kumo All-Season" tires. With the new tires, the traction is greatly improved and the ride quality is slightly improved. Overall, as a used vehicle this car is outstanding given the price, features, and Lexus reliability.
The OEM suspension and tires are terrible. I changed the tires, and that improves the ride substantially, but the ride quality is less than what I expected for a Lexus. A little bit more low end torque and horsepower would be nice.