Comming back to iPhone


It has been arround 3 months without iPhone, i tried to replace my lost phone with Nexus 5, which btw is an awesome device ... but i still prefer Apple, unforunately i would not be able to join the recent or the previous generations of devices, but as far as I remember iphone 4s was a great phone. And here is my question, how is iphone 4s performing on ios7.1?