I use SongbookDB for my songbook... I don't use "dead tree" books anymore. I was tired of people destroying the books via alcohol or other means, fragmented update pages, and general maintenance of the book.
Since printing my books with heavy duty binders and pages cost about the same as an old tablet (I have 7 kiosk tablets now). I tossed out the books and never looked back. After a year of service, I have not had any problems with theft, damage, etc. Although now that I said that... it's gonna happen
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Also there is the wow factor... I get compliments about the system all the time. "why doesn't everyone use this?" is a common one.
While we mostly get high kiosk usage, my regulars tend to use their smartphones and because we turn on the software before the gig starts, they can get online quicker and we have a nice rotation ready to go out of the gate.
And of course, if a singer can't find something, they know that I am their to help out
If for some reason someone wants to browse my songbook, I do have an exported master PDF file that I can run on the tablets: Scroll to your hearts content.
This also isn't to say SongbookDB is perfect. It has some annoying things I'd love to fix, but it's nothing I can't work around.