At 10,000 miles my STS developed a thumping noise, which was especially noisy at low speed. Our dealer diagnosed this as a tire problem and replaced (free of charge) our front tires. The noise dissipated to almost nothing, it is but still noticeable in the rear tires. I was a little surprised that the dealer charged us for a full alignment on the new tires.
Without question, the ease of handling and the general appearance of the car
The same as everyone, the glove box and trunk are too small. It should also have a larger date and clock font. Our black car should have black undercoat, every stone chip shows up white.