It's hard to tell until we can finally drive them. The tundra I had come in was a mess. Fit and finish were poor. Enough so I chose not to buy it. I think they'll sort out the rattles and fit pretty quick. It's a core competency for Toyota. I've not only never driven an LX600 - but I've never even seen one in person. I'm living in AK right now and so I'm a isolated from everything for a bit until I get back down. Maybe as much as one more year.
I thought the ride quality and cabin noise in the Tundra I drove were excellent. Much improved over the last generation. The power delivery from the TT6 in the Tundra was also fantastic. I didn't have any issues with the shift logic. Basically invisible as far as I could tell. Much improved over my 5.7 tundra. I find the exhaust drone on the 5.7 exhausting on long trips towing. It's the OEM Limited trim exhaust. It's just kinda noisy under mid range loads towing a travel trailer at highway speed. I'd happily trade powertrains. I would not consider the new cabins or body style an improvement though. The body design group made it worse in almost all aspects. Smaller windows, smaller cabin, smaller bed, worse visibility, and yet also somehow longer and worse turn radius. Not impressed on that side. I think the new LC/GX looks great though as far as body design and layout (other than the cargo area battery issue). But the LC200 isn't exactly a great cargo area either with the 3rd row, so maybe that's a wash.
I will start with saying that I did learn as much as I can about LX600 when I ordered LX570 at the end of 2021 (one of the last made) I didn't want V6 turbo and electric power steering. But I didn't know anything about interior. I've seen one in person but didn't sit in it and didn't touch it. It didn't look bad, but seats particularly did look cheaper/cheesier if it makes sense. Oh, and I didn't care about one piece 5th door for sure!! I only miss car play, but I knew I can retrofit one and after 2 years never did
A lot of russian youtubers went over LX600 criticising interior quality being not as good (fit/wobble/etc).
I set in new Tundra and yep, it's plastiky, rattles, etc. But what do you expect? Toyota is always like that. Thats why they have Lexus. LC200/100 is more of a exception vs rule on Toyota. And price reflects that.
Right now I have 3 trucks in garage: LX470, LX570 and GLS450(2023). 570>470 interior-wise. I feel like it wears very nice, I have 30k on it and not much going on.
Mercedes GLS feels cheaper inside. More features, screens, blah, blah. But overall somehow it doesn't feel premium. Seats definitely not as good.
I think about it like that: There is not much money to be made on those big trucks. Tech/screens is cheap once you have it(R&D). But insulation, leather, plastic, metal - all raw materials and cost money. I don't feel like increases in price on those cars follow inflation.
At the end - we see more "features" and less "substance". And I like my things to be simple but quality.