Awkward title, but you clicked anyway, yes?
WOW, just WOW. This thing is great to read on. Someone said that magazines would be really hard without zooming in, well... On the Kindle Fire, magazines weren't readable at all, but you can easily still see very little text clearly on the Mini. Comic books look GREAT, no need for panel zooming, easily read by swiping through like the real thing.
As for Kindle books, I had to make text much, much, much bigger and remove margins, but I find it really enjoyable.
Really nice to type on too. Can you use it with one hand? NO WAY! It's a little awkward compared to my Fire, and I have pretty big but skinny hands too.
Anyway, those are my two cents for anyone interested, better me than someone who hasn't used a KF for the last year.