My iPad Mini 2 ("retina Mini") is just a year newer than yours. I still use it daily, mostly to read books, for which it is the perfect size. It does have the advantage of having a 64 bit CPU.
Compared to a Kindle PaperWhite it is very little adequate as a book reader.
I can put my PaperWhite into my bag and take it to the beach, between sand and water, or to the mountains, even at high altitudes, or under the sun, it reads well, does not overscale, and does not get damaged!
It's lighter, it doesn't have all that junk of useless applications on a device that should only make you read a book, the screen doesn't tire your eyes, and the battery lasts infinitely longer!
I cycled up to 200 km a day this summer with a "be wild" hat on my head and a swimsuit and towel in my light backpack, and during breaks, while resting under some plants, or on any makeshift beach found along the lake, the PaperWhite was the ideal reading tool!
What well-being
Sorry for Apple, but… they need to (re?)invent a dedicated device if they really want to *compete* with the Kindle PaperWhite, which *IS* the best device I've ever tried on the road!
Similarly, if you ask a cyclist to tell you what he/she thinks of an iPhone, or an iPad mini used as a bike GPS navigator(1) ... well, there is nothing better than a Garmin Edge 830, or the new ones with solar charging!
edit:
(1) I'm not joking, in my part for several months they have advertised magnetic attachments to attach an iPhone or an iPad Mini to the bicycle handlebar, with GPS navigator apps.