Some feedback at https://forums.macrumors.com/threads/should-i-update-my-iphone-5s-to-ios-10.2029498/How is 10.2.1 on the iPhone 5s? Any Battery Drain or issues I should know about before downloading it? Is it worth it?
Worse compared to what?Don't update its makes the performance worse i am using a 5S and noticing it
10.2 in my experience
I've got a 5s, it's not worse for me. I would say about the same because I haven't noticed any difference either way.