Hi, I am a ipad3 user and not happy with ios7 UI, so still a ios6 camper. But then I find a seemingly great app (The Elements: A visual exploration) for free and when I try to download, it says ios7 is required! Is this becoming a trend that force people to upgrade or ... ??? What's your thoughts? Do you think because of some app, it's worth upgrading os even you are not fond of the new UI, etc? Thanks your opinion.