Should I upgrade to the ios7?

I have the iPhone 4S and I'm not sure if I should upgrade to iOS 7? What are some good and bad things about it? And if I do upgrade will it delete everything I already have?

No it won't, open itunes, back up and synce iphone, then download ios 7.It improves battery life.looks amazing, only bad thing is that it takes a while to get used to how it looks

Yes…

http://www.gottabemobile.com/2013/09/18/ios-7-iphone-4s-first-impressions-performance/

No… Nothing is deleted.

Upgrade, there's more features than I could list here. Nothing bad about it really.It'll keep all your current stuff, don't worry.