I love the size and weight of my iPad mini 2. It's starting to slow a bit, but is not intolerable for my usage - email, internet, and the Amazon app mostly. The only use for which it has become too sluggish is a cycling app. I'm wondering if I should get the mini 4 (refurb) to enjoy the form factor as long as I can, since it doesn't appear that there will be another iteration. Thoughts? How is the mini 4 doing with iOS 11 if you've updated (I'm not updating my mini 2)?