That's exactly it. PRS-505 is 0.5 and all others are 0.9 for simple text (no graphics). I don't believe anyone here reads at 75% black when you can get full contrast in your text (8 grays versus 2 grays).
So basically, if someone didn't put the numbers wrong on the wiki, there is an 80% increase in time when NOT using a PRS-505 (in 2 grays mode).
That's an extraordinarily large difference in features when comparing which device to buy*. One that is left unmentioned everywhere else.
*You see, I'm buying something after the eslick or kindle2 comes out. I'm just waiting for some price drops, but if they don't occur until I finish all my paper Asimov novels, I'll buy one anyway. (don't reply to this paragraph, on penalty of serious off-topic-ing)
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