CD-ROMs have proven balky and difficult on networks, and may not be available when needed most. They are sometimes less current than print sources, and may not contain all the contents of the print source. There have been occasional mistakes in hypertext linking, so that the link takes the user to the wrong document. Each vendor uses a different search engine and interface, so that transferability of skills is limited. Vendors seem unable to decide how to price these products.
Upgrades come unannounced, and with no documentation.
The Internet is chaotic and unstructured, and contains less really useful information than lawyers have been led to believe. There are, of course, very useful legal sites, but change is occurring so rapidly that today's favorite site may be gone tomorrow. The Internet itself is being rapidly commercialized. In a very few years, I think that it will be more entertainment than information. 10 Something may evolve to fill the information role the Internet now has, but I would think that it will be quite different.