I am a student and this is one of the best dictionaries I have ever had.It explains all the possible doubts a student can have, collocations, phrasal verbs, spoken expressions, confussing words...the software is great, I hardly use the paper dictionary cos the CD has the same and it is much easy and quick to find what I want, with the advantage that the software includes the language activator dictionary (2 dictionaries in one software) and when you look for a word, you will see also this language activator as cursiosity and you will learn much much more.
I have used the oxford learners and I think that this dictionary is better because the cds provided will help you much more in order to improve your level of english (as you will find a lot of extended information).
to sum up, if you are a student of english and you need a good dictionary, this is THE ONE!