Got it downloaded and installed overnight.
I haven't explored very much since the upgrade but I have to say I'm disappointed. I can tell that they's gone for simple, but the new built in app icons look dull, flat and boring. The look of the calendar and reminder apps is awful. They've gone for simple, but actually gone through simple and out the other side.
I'll admit that I like the little swipe up control panel thing, but lets face it, that should have been there well before now.
As for the stupid 3D effect that makes the icons move as I move my iPad, wtf? What is the point? I'll bet somebody spent ages programming that and all I can say is why, it does nothing to help the user or improve anything. All it does is add to the Glamour that Apple like to provide, that sparkle that has no use other than to make people go ooooh!
I'm sure that there are improvements under the hood, but so far I am very underwhelmed by iOS7. To me, it's just a collection of things that should have been present long before now. The extra Find My iPhone protection, the control panel etc. There is nothing new or innovative in there.
I haven't tried the multitasking additions yet, hopefully there's something in there that make this upgrade worthwhile. I'm not holding my breath. I'm also holding off as long as I can before I have to upgrade my iPhone 4 ans I suspect that it will not add anything to that, except slowing it down.