I’ve been using iOS 7 on some device since the original developer release during WWDC and I’ve been impressed with how it has shaped up. So, with no hesitation, I recommend you go and update as soon as you can.
It will take a little time to get used to, but I think that the progress Apple has made with the changes, in almost every case, are a good step forward for the platform. The look might seem radically different, but close enough to iOS 6 as to not make it disorienting.
Just go and update as soon as you can. I’m not going to waste any more keystrokes on this.