Not very good
I bought this thinking that it would actually be a good dictionary, but it is terrible. Of the forst 10 words that I attempted to define with it, only about 6 of them were found. Also, there is no copy and paste function using cmd-c and cmd-v on the keyboard, so you must right click to paste. Not a very good dictionary. I would like my 99¢ back, please.
This dictionary works great for my spanish school work I use it almost every day.
This seems to be a rather small dictionary (e.g., I was unable to find "sobrar" in it), and instead of the usual information (whether a word is a noun, adjective, verb, etc., if a noun whether masculine or feminine, if a verb whether pronominal, intransitive, transitive) it includes a lot of (not entirely relevant or useful) examples of how it might be translated into English. The one good point is that it seems to have quite a few phrases or combinations, especially of verbs. It is certainly better than no dictionary at all, say, when you can't find a wi-fi hotspot to get a good online dictionary.