I have been reading exclusively ebook since 2004. About 5 books a month, first with PDA then PDAphone.
Before I moved a lot in train so it was more practical to read on my small PDAphone that I always carried around.
Now I am interested in a bigger reader, but I hesitate between a PRS-505 and a high-end PDA like the Ipaq 210 (4" VGA screen)

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I have questions for the users of E-ink device :
- Is a 6" screen really necessary for ebook that support reflow and don't have image or any complicated layout?
- Is the PRS-505 really usable in bed with only a bed lamp as light input?
I am using for the moment a 2.8" screen (HTC P3300) to read and don't get tired even after long period of use.
It's not that I have some kind of bionic eyes, In fact I have glasses and get tired very quickly without them when using a normal computer LCD or reading a paper book

But even without glasses I can read on my P3300 for hours since getting tired.
Which kind of device should I choose?
I find the 2.8" screen to be small, a bigger screen would be great but a 6" one seem rather big.
Battery life is not an important issue, as the battery life of a PDA is already more than sufficient for me.
It would be great if some users who switched from a PDA to an E-Ink device could give their impression.
Is the E-Ink screen really more confortable? Is the absence of backlighting not too annoying?
Do you think moving from a 3,5" something to a 6" was a great change?
or if you had the choice, wouldn't you prefer a smaller E-ink screen?