Not sure why I didn't realise earlier, but if you load these videos up on an iPhone 5 you get a great feel for iOS7 as they play full screen and as if you are running the OS
Agreed. I have the beta on my 4S, and while it doesn't quite look the same as it would on a 5, I'm finding a lot more small glitches and inconveniences that I wouldn't see if I just watch Apple's carefully edited videos.
I don't do betas anymore. The entire point of iOS 6 is it is stable and reliable. If I want more features with less stability and reliability I will switch to Android lol.