Z Fold 4 going 2 years - the hinge on this can fail early, but fold 5 should be solid and can be found £600 refurbished.
Samsung warranty is notoriously bad though, so can’t recommend for that reason (no personal experience).

Hinge durability is the main concern.
I would not buy in yet unless you plan to upgrade every ~2 years.
Make sure the manufacturers warranty is solid.

Software-wise, I’ve not had any issues whatsoever.

I love it and would hate to go back. You have a normal sized phone that can make various otherwise awkward activities on small factor quite comfortable unfolded: note taking, film watching, reading, Internet in general.
It is so good to be able to whip this out anytime, anywhere.

It literally replaced 3 other devices for me that I used to drag around to cafes, work and when travelling.

I considered this overpriced bs until I got to try my friends device. Now I just consider it overpriced.

I mean, yeah, what kind of relationship did you expect?
They’re not running youtube for the good of their heart