I have iOS 7. I didn't pay for it.
Some of the things I really DON'T like is how when you pull down from the top you can't see the weather and you can't tap to tweet anymore. Notifications are still there though.
The new folders take more time to open, but that may change when it's released to the public.
The icons are bigger.
The font is different, and me being a low key font snob I don't like it. I turned on text enhancement to make it easier to read.
The time on the lock screen is difficult to read because there is no background behind it to make the white font stand out.
You can't swipe all the way to the left and search your phone + the web & wikipedia anymore. You can pull down from the top and only search your phone.
iMessage looks very basic. Very. It's almost boring. The only thing I like about it is that the blue/green bubbles form a gradient.
It's still pretty glitchy right now but I'm sure they'll clean it up a lot before the Fall.