You might also take a look at this post by Julie Jones on the official blog of the UConn Law Library. Not only does she link to the ATL article but to a recent article on law.com that addresses how firms are saving money by gathering metrics on DB use.
Better still, take a look at this survey compiled in 2008 by Paul Lomio and Erika Wayne from the Stanford Law School library. You will find that a substantial number of responding law firms (about 30%) wanted LOISLaw taught as part of a legal research curriculum.
And now for the caveat - LOIS is really a database for primary law research. There are some secondary source materials available on LOIS but not enough for most thorough researchers. Should this deter a researcher from starting with LOIS? No. Here's a quote from the LLB&L memo:
It [LOIS] is not viewed as a substitute for Lexis or Westlaw, but as a tool to be used to familiarize yourself with precedent related to new cases or issues or simply to find cases, statutes or regulations.Looks like good advice from a managing attorney with two goals: saving money and providing good client research service.