Useful
It's a wonderful reference book for anyone who knows a little Greek and wants to read NT in the language it was written in. It provides translation for almost EVERY word apart from simple ones. This way one can basically try to read NT without any dictionary even during an elementary course.The book is however something more than just a contextual dictionary. It contains also some elements of a grammatical commentary. For example, I learned from it that the form 'pros to' in 'blepon gynaika pros to epithymesai auten' (Mt 5:28) may render a Semitic construction with force of gerund ('lusting', 'with lust').The edition is Catholic. If you're not Catholic yourself, don't worry. It's still something you should have in your personal library. The book doesn't seem to have any ideological bias. It represents a pure linguistic approach.