Yes, I've had the Samsung zFlip 4 for a year and a half. It's great, my phones used to always fall out of my jacket pockets, but the center of gravity of the folded phone is much more stable and I don't have that problem anymore. Can fit easily into my front overall pockets too which is nice. Screen feels much safer as well, since it's usually closed.
(I work outdoors, with overalls a lot)
My only issue with it is the lack of a headphone jack and lack of a removable battery, and it gets overheating issues when I'm outside on hot days - but so has literally every phone I've had. Outdoor worklife is tough on phones.
There is a visible crease, and some friends have mentioned that the fold line would bother them. Personally it doesn't bother me.
The snap close is especially fun, too.
And I like how I can have it propped up in the L position, nice way to have a little screen playing YouTube videos in the background while I work.
Not to me at all, way less bulky. It's thinner than my wallet, and since it's not long, it doesn't jam into my leg when I kneel or sit down. However, I don't have a case for it, not sure how it would feel with a case.