This is a very good lexicon of Greek as it was written in medium and high registers from about the second century through the fourteenth century of our era. As a Byzantinist, I find that this lexicon picks up what is lacking in the Liddell-Scott-Jones. It includes terms from daily life, like a word for swamp derived from Slavonic, or bureaucratic terminology derived from Latin. The references to late Antique authors make this often more useful than Erich Trapp's newer work in appreciating the changing meaning of a word from Antiquity into the middle Byzantine period.
As the other reviewer rightly noted, the offset is poorer than modern technology permits. Likewise, there was no reason not to offer this volume in hardback, as volume two is. In the end, I could not find a used copy of Sophocles for less than $300, so the two volumes at about $60 each were an easy choice to buy. The bottom line is that you need this lexicon, if you intend to read a lot of Greek writings from about 800 onwards. Otherwise, Lampe will serve you well for many of the writings of late Antiquity.