It’s starting to chug now with modern apps (or legacy apps with new updates), the touchscreen is becoming increasingly unresponsive, that battery health is starting to go off a cliff… but all those factors can be levelled at any two or three year old phone.
The hinge is the problem. My understanding is that Samsung has made a better design for the SGF 5 and 6, but i’m already on my second phone after the hinge caused the phone screen to bleed out from the centre, and I’m getting the crackle of doom from the hinge starting to sound already.
If you’re desperate for a flip phone, then I’d advise you stay clear of the SGF3 and consider the Oppo Find N2 or the Nubia Flip.