This is a phenomenal dictionary. Some things that make it so great:
1) Huge numbers of usage examples, at a wide range of levels of
formality. The examples give information that's lacking in most dictionaries, such as which preposition(s) to use with a given verb. They also contain a wealth of idiomatic constructions. I'm amazed at how much time I've spent just browsing through the examples in this book.
2) Excellent differentiation between multiple meanings of a word. If there are multiple Hebrew words that correspond to a given English word, they are very clearly differentiated, often with examples that further clarify when to use which (see above).
3) The vocabulary covered is VERY comprehensive and covers all ranges of style, from literary to colloquial (including, I was happy to discover, many obscenities).
This dictionary also is not necessarily for beginners. Some reasons that it's not necessarily for beginners:
1) It's English-to-Hebrew only; if you're looking for a very first dictionary, you might do better with a bilingual one.
2) It doesn't list the gender of nouns, nor does it list irregular plurals. (Gender and plurals can generally be figured out, if you know the rules, but it's nice to have them made explicit.)
Since this dictionary is published by Oxford, the English is overwhelmingly British. This is most obvious in the fact that many British idiomatic expressions are included, while American ones seem less well-represented...