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Just my two cents...
I think we all differ... and our eyes do differ... I am finishing my PhD in Finance and, as any other doctoral student, I read a lot. And so do my colleagues. I, for one, can't stand reading on LCDs.
I did use an Ipad for a while (bought it hoping to use it for annotations) and gave it to my dad. My eyes would just water after a while and I got terrible headaches after reading for 6+ hours. Same if I sit in front of a PC without taking breaks.
With the PRS-900, I don't have that problem.
Sure, annotations were easier on the Ipad, but if I can't read for long... it's a pointless advantage. And don't get me wrong - an Ipad does have other advantages I recognize... but it just won't do as a reader FOR ME.
Now, some of my colleagues don't seem to have a problem with LCDs. One of my office mates simply reads everything on a monitor, another one on his Asus tablet. Eye strain seems to affect them less.
But one advantage of e-ink is doubtless... battery life. I often fly Oklahoma-Italy and the trip takes me 20+ hours. My PRS900 loses one tick of battery life... if that...
On the other side, reading in direct sunlight has never worked for me. Call me unlucky, but I seem to constantly get defective devices that fade in the sun - from SONY or Amazon. Go figure. I got tired of asking for replacements. But my PRS900 is NOT readable in direct sunlight - the text just disappears.
On the other side, I am lucky (???) in so far that I don't have a life, haven't seen a beach in years, nor any sunlight, as my office doesn't even have a window. Great life, being a PhD student.
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