[Samsung Galaxy Z Fold3] domineus:
So device is in hand (it got delivered early) and these are my initial impressions:

It's larger than the fold and that's evident on the cover screen. It actually feels like a phone rather than a cramped remote control

It feels premium and while people complain it is heavier than the fold 3 I can't feel it that much. The weight is better distributed when the device is closed. Definitely the fold 3 feels lighter when it is open

Materials are super premium. The vegan leather feels nice. But other parts of the device feel seamless as well. Definitely a premium device

Fingerprint sensor is so fast. Day and night compared to the Pixel 6 Pro - actually Google should be ashamed.

You can OEM Unlock the X Fold! I found the option and it is enabled. Now whether or not it is actually enabled is anyone's guess but seeing the option there (and by proxy developer options) is rather great.

Putting my sim in the device I received the error because I'm not in mainland china, 5g won't work. But I suspect strongly my 5g will work. Currently using UK sim (3).

Camera is actually rather good. There's tons of configuration I haven't gone through in totality. But the photos are much closer than you realize. Which is to say on the main sensor Samsung and Vivo are neck and neck. But in zoom and other categories, X Fold demolishes Samsung

Software. It's a lot to take in and absorb. Mainly the keyboard could use some work and the alternatives I haven't found a split keyboard so if anyone knows of one, provide a suggestion.

You can also make the same argument for launchers available. Vivo stock launcher works, but there's a lot of swiping where you expect one action and you get a completely different action. Again it is probably due to using a chinese rom

Similarly, there are some things that don't directly translate when language is set to english. It's an annoyance rather than a frustration but you get what you get. It's not a global rom

Google Now feed I do miss. Again it's the muscle memory I was referring to in point 1

Software is SMOOTH as butter. The fold isn't so smooth and that's an issue directly with Samsung based devices. Which is a shame.

Charging is fast. That is all. It's slightly above the 37 minute claim BUT it's very fast charging.

The crease you can't really see it versus the fold 3 you can see and feel the crease.

Dual SIM! I came from a US variant fold 3 which didn't have dual sim capabilities so seeing that in the x fold is a treat.

Silence rocker! I see you Vivo - great idea.

There's a lot of bloat on the device. There's really no way around it and it'll take time to remove the bloat. I haven't tested rooting the device (yet) but I probably will at some point

There's something really satisfying about the tactile feel of the device and the opening and closing of the device. It's spectacular.

Increasing the speed of animation in developer options are greyed out surprisingly. It is okay but such an odd choice especially since OEM unlocking isn't greyed out

Those are my immediate thoughts. My major annoyances are the lack of split keyboard from third party alternatives and at the moment a launcher. HOWEVER if the bootloader can be unlocked (and at least I see OEM unlock there...) we could have some very fascinating options with any luck

Edit

Googling yielded a ton of options. By default the font is rather big - decrease the font size and that's one huge pain point taken away. You can also have an app launcher too rather than the nano shortcuts that is on default.

Slowly getting through the os and finding it actually pleasing. There's some software concerns with third party apps but I would say this is SUPER EXCITING