Some volumes are less expensive, some are more. One practical concern I have with a digital library is that technology changes. If Libronix/Logos as a company ceases to exist, then after 5-10 years, so might your ability to run the software. Eventually every book you purchased and unlocked will become inaccessible. A physical book will never become technologically obsolete and can be easily passed on to posterity. Ten years ago Windows 98 was important, the rage, brand new; now it's obsolete and won't work on new hardware. When I buy an expensive reference work, I want it to be accessible to me the rest of my life.

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Casey Bessette
Westminster OPC • West Suburbs of Chicago • My Blog: Paradise Regained

"It is part of the calling of the ekklesia to learn to know the love of Christ that surpasses all knowledge and also to make known within the world of science 'the manifold wisdom of God' in order that the final end of theology, as of all things, may be that the name of the Lord is glorified. Theology and dogmatics, too, exist for the Lord's sake." — Herman Bavinck, Reformed Dogmatics, vol. 1, p. 46