College & Research Libraries has released an e-print of "Assessing the User Experience of E-Books in Academic Libraries" by Tao Zhang, Xi Niu and Marlen Proman.
Here's an excerpt:
We report findings from an assessment of e-book user experience (search and information seeking) from usage data and user tests. The usage data showed that most reading sessions were brief and focused on certain pages, suggesting that users mainly use e-books to find specific information. The user tests found that participants tended to use default keyword search and browse the search results. Experience levels with e-books and features of e-book platforms influenced users' information seeking in e-books. The assessment results have significant implications for designing e-book features to support users' reading strategies and help libraries create a consistent user experience.