We use the VitalSource curriculum, but unlike other schools, we have the texts loaded directly onto our computers, so there is no DVD to fool around with.
It still costs a big chunk of change to license every year (around $1800 for us), but we have well over 110 texts in our bookshelf right now, so I suppose that's worth it. The downside, of course, is that I probably won't ever even open 1/3 of those texts, much less spend hours pouring over them in study.
I've found it just fine to study from, and my school lets me print out thousands of pages for free on the multiple laser printers they have, so I've printed certain sections every now and then. Mostly I've printed out review series books and studied from them, using the other texts in the electronic bookshelf to supplement my studies.
For what it's worth, my school is the ONLY school that uses ALL of the Vital Source technologies, meaning, we use: Vital Key (the electronic bookshelf with texts), Vital Square (class/instructor message boards), Vital Quiz (the testing format), Vital Case (our PBL-case program) and on and on and on.
PM me if you have more questions. I don't want to post more here than you've asked for.
To sum: I have no problems with the electronic text format. I don't read a whole lot anyways, and I think most of my student colleagues can agree that just because a teacher assigns an entire textbook for reading does NOT mean you even have to crack the book. It depends on the syllabus, notes, powerpoints, etc., that are offered by the instructor.