The S80 2.9 model's 2.9-liter engine enjoys accelerating quickly, particularly during brisk highway entrances of the 0-to-80 mph variety. If a little sluggish immediately off the line, the S80 has a fat power band -- thanks to the 2.9-liter's variable valve timing -- and virtually leaps at 2,500 rpm, the revs slamming the 5,500-rpm mark in a blink.

At speed, the 201-horsepower engine has plenty of power in reserve, making passing at high speeds an effortless maneuver. The transmission responds in kind, crisply kicking down to third gear at the tap of the gas pedal for added oomph.

Throttle response in the 268-horsepower T6 is even more impressive. Its dual turbochargers are small units that spool up more quickly than larger ones, erasing almost all apparent lag to make for exhilarating standing start acceleration. Swift starts do require two hands on the wheel, however, as the front-wheel-drive S80's torque steer becomes quickly evident.

On the road, the S80 handles straightaways and turns with assuredness, if a little softly. Its smooth handling and easy ride feel neutralize most road imperfections without totally eliminating road feel. Steering effort is firm, although steering feel itself, like the ride, remains a tad soft.

The brakes just may be the most appealing feature of the S80 driving experience. They grab decisively and pull the big S80 to a stop with authority, even in panic situations. On one stop-and-go-filled test drive, braking distances were consistently overestimated: This car can stop much quicker than you'd think. The S80 came to a stop well behind every stopped car, stop sign and red light.

The 4-speed automatic transmission shifts smoothly and precisely, most notably at higher loads. But occasionally at lower speeds, a quick stomp on the gas causes the 4-speed unit to trip over itself on downshifts. The momentary bog creates a slight response delay and lurch of the car once the downshift takes place.