I had some doubts myself before buying my first e-ink based device. It helped a lot to watch movies on y-t where guys were test driving them.
Not all e-ink displays are of equal quality. The newer ones should be ok, those claiming 16 levels of grey. However the definitive test should be made by your very own eyes.
e-ink displays look to your eyes basically like paper. I absolutely love my Kindle for reading books.
For papers though, not so much. The screen is too small for a layout format like PDF to work. The document has to be able to reflow for the screen like a proper e-book to work really well, and PDFs don't. I've heard the Kindle DX was great but those haven't been made in a while, otherwise there's a few big ones Sony made which are apparently awesome but expensive.
I had some doubts myself before buying my first e-ink based device. It helped a lot to watch movies on y-t where guys were test driving them.
Not all e-ink displays are of equal quality. The newer ones should be ok, those claiming 16 levels of grey. However the definitive test should be made by your very own eyes.
Edit: I don't have a Kindle.