So I just put iOS7 on my iPhone. Here are some notes I have.
-The paralax seems much less defined than what Ive seen on the keynote, but for panorama pictures, its pretty nifty.
-I dont like the headers of the apps (mail, messages, etc.) because they look too much like the new microsoft outlook design.
-Control center is very useful, I love how they put the calculator and flashlight in there, very convenient.
-The lock screen still says "slide to unlock" but no indicator of which direction. To us iOS users, its obvious to go from left to right, but new users of the device may not know that. My initial thought was that you could slide it in any direction to unlock, but sadly I was wrong
-Im not sure if its just a beta thing or if apple removed the spotlight search when scrolling all the way to the left. Either way, I like that its gone from there. (its still a feature on the phone though in case some of you were wondering)
-Because all my apps are still designed for iOS 6, i find it extremely weird that the new icons look very blah, but mixed in on that page of icons are some really nice detailed apps (findmyiPhone, whatsapp, machash, chase, etc.)
-I LOVE LOVE LOVE the new multitasking. While they did completely steal this from HPs WebOS, I for one dont mind because that was the only thing I liked from webOS =P Its easier than ever to close apps now.
-Ive long awaited the siri features to be able to control brightness and other toggles, but with control center now easily available i guess siri's new capabilities arent much needed.
-Im still not sure how I feel about the new animation for going in and out of each app (the home screen basically zooms into the app when you open it, and zoom out of the app when you close it). I like the idea of it, but rapidly opening and closing apps will make me dizzy xD
-I definitely welcome the new font, it looks much better IMO
-The new cellular strength signal icon looks unnecessarily large, seems like that bar can get cluttered real easily.
-The weather app looks great. This seems to be the only stock app which uses the simple flat design of the text and symbols, but the complexity and detail of the background. Its a great balance and looks amazing.
-The keyboard is quite alright. I did expect worse from what I saw in the keynote, but its actually not bad. I will really miss the look of the old keyboard though, I personally like the grey/silver scheme more than the white one.
-And finally they added the 'swipe right' to 'go back' feature. I used that on my macbook all the time, I wondered why it took so long to get to iOS. Great addition