Yes this works. I use it all the time and recommend it to everyone (they're all on iOS6).
OP, there's a tweak that allows you to "thread" screenshots together to make one large image. It "might" only be for safari. I can't quite remember. Aside from that, I am almost positive there's an app in the App Store that allows you to combine multiple safari screenshots for one large image.
But for your purpose, AppInfo is by far the best way to go. Highly recommend it.