Got it installed late last night and initially thought it was a bit Fisher Price, although as I tend to use fairly dark wallpaper, not quite as lairy as screenshots led me to expect.
Have been using it over the course of the day and I've got to say that I now really like it - had mine in one hand earlier and the wife's (still on iOS6) in the other and you can see how gaudy and naff some aspects of the old iOS are.
Loving some of the updated third party apps too - Evernote looks absolutely stunning.
EDIT: with further usage, the animation from the lock screen to home could do with speeding up a little - definitely seems a bit slower than the iOS6 equivalent