This reference book is OK, but I would strongly recommend buying the full hardback edition. Quite often I have tried to look up fairly obscure words only to find that they are not in this edition. Buy the full version.
This is useful, but found many words not included. I bought this to replace a rather battered existing puzzle solvers dictionary and have found myself returning to the old faithful. Have now given new book to a neighbour, and she finds it really useful, so perhaps it's ok when there isn't something for comparison