Should I do the new software up date?

A new update came on my phone the
IOS 7.1.1 I have a iPhone 4s is it worth it to do it? Or will it just make it slower?
Has anyone else updated it on a 4s?

My dad has an iPhone 4s and I use it sometimes and it works exactly like mine. (I have an iPhone 5s)

Just like in the Windows world, you MUST always do the latest iOS 7 Updates for your iPhone, or other Apple Mobile devices.

These Updates include bug fixes, Security Updates, Anti-Malware protection, among others.

And, it won't FUBAR your 4 S, unless you have already chosen to JailBreak it.