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It really depends on your eyes.
I can read easily without glasses at ~6 inches and under and with glasses at ~18 inches, so that's where I hold things to read. Which means all those devices with 200-300 ppi don't look any different to me from lower ppi devices at normal reading distance.
Specifically, I can't see any difference between the iPad mini's screen and the iPad retina screen at my normal reading distance and I can't see any pixelation on my 127 ppi laptop screen which is 24 inches away from me.
The size of the font affects me more than the ppi. I can't read for any length of time on my retina screen iPod Touch, the tiny print fatigues my eyes, but I can read for 10 hours at a time on my 150 ppi Kindle Keyboard. I increase the font on every device I use, at least to 14 pt, but larger if I can.
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