I upgraded from the 5 to 5s, paying full price ($800 with tax) for the 32GB model. After a week and a half, I decided to return the 5s and go back to my 5.
I didn't notice any performance improvements over the 5. The camera is a bit better and the new slo-mo and burst modes are quite nice. TouchID was the biggest improvement, but I just can't justify $800 for a fingerprint sensor and slightly better camera.
An upgrade from the 4S is huge and a no-brainer. An upgrade from the 5, to me, would only be worth it if you can get close to break even on the deal by selling your 5.
I didn't notice any performance improvements over the 5. The camera is a bit better and the new slo-mo and burst modes are quite nice. TouchID was the biggest improvement, but I just can't justify $800 for a fingerprint sensor and slightly better camera.
An upgrade from the 4S is huge and a no-brainer. An upgrade from the 5, to me, would only be worth it if you can get close to break even on the deal by selling your 5.