The iPad mini 2 is fantastic hardware. The 3 from what I can tell holds limited value if you'd rather save $100.
I do my best to keep our household in current technology. More my wife if the difference is noticeable. I couldn't however justify an upgrade from the 2 to the 3 for her. I couldn't in reasonable understanding recommend it for anyone else.
ApplePay is truly fantastic but a tablet isn't feasible for these tasks and the limitation to ApplePay apps only kneecap that even more.
Get the deal while you can.
I almost expect Apple to have another event for the release of the Apple Watch that includes the iPad Pro and possibly the iPad Mini 4 early next year.
mini people may be pissed if they do...