Julie Waters et al. have published "A Comparison of E-book and Print Book Discovery, Preferences, and Usage by Science and Engineering Faculty and Graduate Students at the University of Kansas" in Issues in Science and Technology Librarianship.
Here's an excerpt:
The availability of science and technology e-books through the University of Kansas Libraries is growing rapidly through approval plans, e-book packages, and electronic demand-driven acquisitions. Based on informal conversations with faculty, questions still lingered as to the acceptance of books in the electronic format by faculty and graduate students in the STEM disciplines. To learn more about book format preferences, a survey was distributed via e-mail to 1,898 faculty and graduate students in science and technology at the University of Kansas. The survey included questions focused on print book use, e-book use, format preferences, and demographics. A majority of the 357 respondents indicated a preference for print books indicating many of the oft-repeated comments about the disadvantages of reading books on a computer. Patrons using tablets were more inclined to access e-books. The survey indicated a continuing need to purchase books in both print and electronic formats, and to market the availability of e-books to University of Kansas patrons.