This dictionary is an excellent reference for anyone in level intermediate or above. Rather than learning French by looking up the word in English it's best to learn in French. You expand your vocabulary and you translate less when speaking. Mind you it takes 3 times as long to look up a word- but it's part of learning
As for the dictionary itself, I like that it has 60,000 words. For most of the word, there are sentences to show samples. They bold the synonyms so it's easy to find the definition you are looking for the specific use/meaning. I plan to be quite fluent in 2 years but I'm certainly not worried about the need to upgrade the dictionary.
Since I wasn't sure of the best French-Frecnh dictionary, I went to French Amazon to find out which dictionary the French people were using the most- afterall they use French-French dictionary the most. After my purchase, my French friend told me that Petit Robert is the best (he used it at university) and so did my French teacher- but she said it's big. Big and heavy it is- hence the 4 star. I LOVE my Petit Robert. I look forward to an ebook version compatible with iPad. That would make my day and make the dictionary a 5 star!