NFHS rules app for Iphone

[Mrcrash3]

I noticeded this App is now available for the I-Phone has anyone purchased this app?( even for Android) How do you like it?
Also is this an app that has to be purchased (like the Rule books) every year, or do you get the updates when they are available? Just asking because I would rather purchase this in the fall when the rule changes come out.

Thanks Again