I don't really get the ones that are tablet sized but fold down to phone size, but I do love my regular sized phone that folds in half.
It fits in all my pockets, it's easier to carry in my hands, the folding in half is great for using the flashlight and the camera because you can be hands free, and while you could have this on a non folding phone I do really like the half screen on the back.
I did break mine eventually after a year, but that is honestly pretty par for the course for me - and it was fixable. In its defence I am officially clutzy and drop things regularly, and also it fell out of my pocket at one point and got driven over by an SUV (and it still worked for another month, I was impressed. I dropped it one last time a month later and the screen detached at the fold and the hinge went askew).
The pockets thing is 100% more of an issue for anyone wearing women's pants. Mine are 50/50, and the difference is very annoying.