My 2021, not black label, 20" wheels, is very comfortable, and it rides great on highways. I love the lane-centering with the adaptive cruise. Bright headlights, which is crucial. Very quiet.
My biggest criticism is that it rides like a bit of a truck on local roads. My first SUV. Comparing to both a
Cadillac XTS sedan and a Lexus LS430, it rides much harsher in that it feels somehow crashy on imperfect roads. I do not have the adaptive suspension, but also do not have the 21" wheels.
I have the mid-level Revel, and it doesn't sound great to me in the bass. Minor quibble relatively.
The base seats lack separate front/rear up/down controls on the passenger side: just a single motor. Cheap cost-cutting. May not be issue if you get the 22 ways seats. Seats also feel too short. Aviator has far more comfortable seats. Try your specific ones for comfort.
The lower door panels (like near the door cupholder/door pocket) and b pillars feel like cheap plastic out of a Corolla or something. Again, obvious cost-cutting. I doubt black label has different door card material there.
Overall, the Lincoln has a good blend of luxury but to me feels like luxury-minus. An A-. Not because it lacks the Venetian leather of the black label, but for reasons above. Mostly, the ride quality on local roads.
It is a great highway cruiser. The 4 cylinder is raucous outside when cold and vibrates a bit at idle, but is less gruff than the Lexus RX, and it lacks the infernal electric doors of the RX, which I had as a loaner on my LS430. It also holds more cargo, which is why I did not go with an RX. In-laws have a
Cadillac XT5, but I dislike GM headlights and it is smaller.
Overall, the Nautilus is nearly ideal as a comfortable highway cruiser, even if the Lexus seemed a bit more lux on the interior, offset by engine gruffness, electric doors, and space.
Prices seem a bit higher than 1.5 years ago, even used, for comparable models. Around 2k higher on average now.
You don't need the black label used. You can get same options on Ultimate package, minus the funky wheels (but the fan wheels are very nice!) and the Venetian leather. It's cosmetic, because you don't get the black label perks used. I think the adaptive cruise/lane centering is great, the 22-way seats are probably an improvement with thigh extenders, etc., and be sure you at least get the base revel audio. The ultimate and black label both give the higher-end Revel audio, which might be better (or not so much).
I got mine CPO with new tires that are perfectly adequate (Kelly Edge). Car was like new. No major recalls unlike Toyota V6 turbos or 8 speed transmissions... yet. The 6 cylinders in 2021 had a recall on some, so research and avoid those build in that time.
I keep my cars for 15-20 years, modest miles (150k-200k), so time will tell, but functional and comfortable so far, but not quite luxury ride quality by my standards. It is not my first choice daily around-town car, where I still hop in my LS430, but it is my first choice for long trips.