I have 7.1.2 on my iPad Mini Retina and will never upgrade. If any Apps that I have that says I need to have 8.X before downloading; that "App" gets deleted.
And if any future Apps will not run on 7.1.2; it gets deleted too and I will hunt for their competitor's App to if it will run on my iPad!
You felt the need to share that with us? Didn't know the forum had become Facebook...
You're going to end up with a fairly useless device as more apps start to drop support for iOS 7. We have an iPad mini retina running 8.1.3 and it's smooth, with battery life seeing obvious improvements, so your loss!