The fifth-generation LS strays from its historic place as the embodiment of stress-free comfortable motoring by piling on complicated controls, a less cushy ride and compromised seating. This redesigned flagship brings lots of tech and more dynamic styling. Available with rear or all-wheel drive, the standard drivetrain is a 416-hp, 3.5-liter V6 turbo engine coupled to a 10-speed automatic transmission, but despite good measured acceleration times, the car doesn't impart a powerful impression due to some hesitation at low speeds. (A hybrid is available.) The wide car is too bulky to feel nimble. The optional air suspension keeps the Lexus steady but bumps punch through more often than they should. The cabin is nicely trimmed and luxurious but the controls are extremely convoluted and frustrating; it can take several steps to perform simple tasks.