Not surprising to me in the slightest
His surprising (to me, at least) conclusion: "The low-end, non-touch Kindle 4 is actually my favorite e-reader today."
I've used my old man's iPad to read books, and I've read books on my iPhone and my computers. The lowest end Kindle can't do everything an iPad can (or the Kindle Fire, or those other tablets), but it has the single best form factor, controls, weight and display for long form reading. It's as simple as that.