Never and never will! I got my Nexus 7 2012 for last Christmas and haven't looked back once. I had a cheap Chinese tablet before which introduced me to Android, and when I was looking for a replacement I was reading about the iPad Mini rumours. But when it was launched I laughed at it, way over priced, a poorer screen then the Nexus 7 and a slower CPU. And this year Apple have managed to match the 2013 Nexus 7 power and screen res but at twice the price!
No, IMO now more then ever I think your a mug if you buy an iPad Mini, the Nexus 7 can more then match it for a lot less miney but more importantly, the iPad Air is not much more expensive with a bigger screen but not a massive jump in physical size. I see the iPad Mini as a knee jerk reaction to the tablet market that Apple should never have made, but their are plenty of mugs buying them.
So my main problem with the iPad Mini is its ludicrous price, as for those that claim its worth it as you get the same power as the full iPad, well the same can be said with the Nexus 7 or Kindle Fire HDX yet they don't have inflated premium prices.