Should I upgrade my iphone 4s to iOS 7?

I just got an iphone 4s today, but I'm kinda scared to upgrade to iOS 7. I have heard mixed things about it… It's fast, it's slow, screen keeps going black, battery doesn't last long, battery lasts longer, better interface, etc. I really want to, but I also don't want to mess up my phone. Should I upgrade to iOS 7? Did you and do you like it?

Update.

Its better to upgrade to ios 7 Coz It's improve alot as you can see.

Fore more http://www.apple.com/....apple.com

Updated. But the default ringtone changed.