Damn good. With 516 horsepower and 564 lb-ft of torque on tap, it's delightfully quick, both from a stop and on the roll. It's quick enough to enable you to dive into gaps or make other moves you might not have considered before. There's an M60 version that packs even more power, but honestly, it's not needed; the sacrifice in range that comes with it is a bigger loss than the extra juice is a draw
Give the wheel a turn, and you'll find an unexpected surprise — sharp steering and taut handling, more in line with a sedan than most SUVs. Some credit certainly goes to the giant 111.5-kWh battery pack that keeps the center of gravity so low, but plenty also deserves to go to the suspension and chassis engineers whose work keeps this hefty trapezoid's mass so well controlled even under extreme duress. (My tester came with the Sport Package and the Dynamic Handling Package, for what it's worth, so it was about as made to boogie as an iX xDrive50 can be.) If all Bimmers were still this fun to drive, they might be able to claw back some legitimacy for their slogan.
Speaking of said battery pack, it deserves special mention, because its size plays a key role in the iX's downright impressive range. I took the iX on a weekend trip from New York City to Washington D.C. and back again, a journey of about 225 miles, and while I'd planned out primary and secondary fast-charging spots along the way, I needn't have bothered. Even in summer heat with the A/C on, with traffic alternating between fast-moving highways (New Jersey), intolerable stop-and-go traffic (Delaware) and a mix of both (Maryland), the iX's full battery would have carried it around 320-340 miles, based on the display and my calculations. At that point, worries about range anxiety start to fade quickly, at least in my experience.
Slowing down is reassuring and rewarding, thanks to a combo of mighty physical brakes and a regenerative braking system. The active regen feature is especially — and unexpectedly — delightful; by using the cruise control's radar system, it monitors the distance between you and the vehicles ahead, and dials in the appropriate amount of brake regen. If the road is open ahead, lifting off the throttle lets you coast freely; if there's a car in front of you, releasing pressure on the accelerator slows the iX down to match. It's seamless, intuitive, and improves your experience without you needing to think about it — as the best tech always does.