Cadillac's flagship. The 2019 Cadillac CT6 is the model's final year due to the endless onslaught of crossovers and SUVs, but it still remains Cadillac's flagship sedan. Despite Cadillac's brilliant forays into the performance world with the CTS-V and ATS-V, the CT6 represents how the company sees itself. It's big and stylish, like Cadillac sedans of yore, but full of cutting edge technology that defines luxury sedans today.

The exterior of the CT6 has been recently updated, with an overall handsome look that stands apart from the crowd. Unfortunately, the interior is largely forgettable compared with most of its rivals, with nothing that catches the eye for better or for worse. It isn't an ugly interior, it's just very plain looking.

Shift into SuperCruise. The real calling card of the CT6 is the availability of the company's remarkable SuperCruise semi-autonomous driving system. The CT6 is currently the only Cadillac with this feature, and it's available as an option on the Sport trim and as a standard feature on the top-of-the-line Platinum model.

Unlike Tesla's Autopilot system, SuperCruise will actually drive itself without input from the driver; you don't need to keep you hands on the wheel at all times. Instead, an infrared camera will track your eyes to make sure that they're focused outside of the vehicle and paying attention.

Additionally, instead of using radar and cameras to monitor the road around you like Autopilot, SuperCruise only works on interstates that have been laser-mapped by a fleet of LIDAR-equipped cars. While this does mean that there are less places to use the feature, it also adds a measure of safety and caution to prevent people from using the feature in less than ideal circumstances.

Other nifty features. In addition to SuperCruise, the Cadillac CT6 has several other tricks up its sleeve. One of the best is the optional rearview mirror that utilizes a high definition widescreen camera that allows you to see much more behind your vehicle than you would with a piece of mere reflective glass. Another unique option is Night Vision, which adds a forward looking infrared camera to provide a further look ahead than what you're headlights would be capable of, so you won't hit that deer lying in ambush ahead.

There's also a 34-speaker Bose Panaray premium audio system, but even the standard eight-speaker Bose unit is a great option. Standard features are competitive, with dual-zone climate control, 14-way adjustable leather seats, and active noise cancellation to make the ride that much nicer.

Surprising performance. While the standard 2.0-liter turbocharged four-cylinder engine is nothing to get excited about, the CT6 does pack some excitement. The 3.6-liter V6 that equips all-wheel-drive variants of the low-end models is a step in the right direction, but the real fun starts with the 404-horsepower 3.0-liter twin-turbocharged V6 that powers the top end. That's enough to propel it to 60 mph in five seconds flat, an impressive number for a large sedan.

In addition to the power, the CT6 is one of the best handling models in its class, with a sporty base suspension and optional magnetic ride control that makes carving corners a real joy. However, the overall trend in this segment is moving away from performance and toward comfort, and the sporty suspension makes the CT6 ride a bit rougher than rivals.

Cadillac CT6

Final thoughts. If you want to ride in a big Cadillac luxury sedan, it's officially last call. Cadillac has said that they will be ceasing production of the CT6 in 2019, although the high performance CT6-V may live on. Regardless, it was a short but bright life for the sedan.

SuperCruise is by far the most compelling reason to buy the 2019 Cadillac CT6. The feature is one of the best executions of semi-autonomous driving that we've seen from any manufacturer, and it helps the car eat up highway miles.

Those looking for a more memorable interior may want to investigate the perennial favorite, the Mercedes-Benz S-Class, which, while more expensive, can offer a much nicer overall experience. The Lexus LS offers a famously reliable ownership experience, while those in search of a semi-autonomous driving experience should also investigate the Tesla Model S.

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