This Buick, like others we've driven, floats excessively. After a dip, the nose bobs up and down a couple of times before settling. On the way to a restaurant one night, the Ultra made my wife ill, forcing us to the curb. The soft underpinnings also make the Park feel slightly unbalanced at triple-digit speeds. Still, the Park Avenue doesn't launch its bumper skyward under acceleration or scoop its air dam into the pavement when braking hard like the Cadillac DeVille Concours will.
Body roll is evident, but moderate.
When hustling the 3,900-pound Park through the curves, however, you'll have your hands full keeping it between the painted lines and keeping yourself behind the wheel. The front bucket seats, while properly firm and quite comfortable, offer virtually zero lateral support, which means the driver muscles the steering wheel to stay in place. Definitely not a canyon runner, this Park Avenue. On flat interstate, however, this is the car to have. Acceleration is strong, and the four-speed overdrive transmission shifts imperceptibly.