As a writer, I've been fascinated by the idea of ebook readers for some time - I've had a sneaky go with the Sony Reader sample in Waterstones, but I couldn't imagine what it was like to use a lump of metal and plastic instead of the real thing. This made it doubly interesting to be asked to review ebook readers for a magazine.
I can't comment on the results - you'll have to wait until the magazine is out in November - but I can consider on the overall experience. As it happens I was re-reading the Sherlock Holmes stories, which made it easy to flip my bedtime reading between paper and the various electronic offerings.
The good news is that they were easy to read, and no problem to substitute for the paper. But I confess, I prefered a conventional book in every case. I'm not one of these 'it's the smell of a book, the tactile experience, etc., etc.' people. It was simply a more pleasant experience (and you don't have to turn the page so often).
Page turning is an important factor. Many ebooks turn the page using a button press - and this feels clumsy. This was one of the two huge advantages of using an ebook reader like Stanza on the iPhone. There, turning a page is a matter of a very natural flick of the finger. The other big advantage the iPhone has (shared by the Kindle in the US, but not by any UK ebook readers yet) is being able to summon up a book over the ether. When I was waiting in Bath the other day I was able to get myself something to read despite the shops being closed, and sat happily for around 45 minutes reading on the phone.
So, for me, ebook readers are great when they have the ability to produce a book over the airwaves to fill in some dead time, but as a simple (and still quite expensive) substitute for paper, they remain very much second best.