I do not have personal experience with anything other than the Sony 500 and 505 (I have a friend who had a 500 and decided to upgrade to the 505). The difference in the screen with the touch screen overlay is a mixed bag as far as people reviewing the 600. For many it is a deal breaker but there are also many that say that the difference is more than made up for by the additional features afforded in the 600. I have not seen anyone who does not se any difference however.
Battery life and lack of eye strain are the primary reasons to go with e-ink. My own opinion is that it is definitely the way to go if you are looking for a device to be a dedicated reader.
In pretty much all of the DRM schemes I am familiar with either there is a password required to open the file or multiple devices can be registered to the same account; so generally, sharing ebooks with your wife should not be a problem.
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