I am a Spanish and Philosophy double major and am currently working on my thesis (which is being written originally in Spanish and then translated into English). This app is proving to be very helpful in ensuring that I am expressing myself clearly in both languages. It is definitely worth your money!
In response to the review written by Eduardo 808, titled DO NOT WASTE YOUR MONEY, I would like to point out that the word "would" does not have a direct translation in Spanish, but rather, is a conditional tense, that when conjugated with the appropriate verb, shows that "one would do" something. For example, "I would like to taste a hamburger," when translated, uses the verb GUSTAR [i.e. to like] and conjugates it into the conditional ME GUSTARÍA; "Me gustaría probar una hamburgesa." Similarly, "were" is a past tense translation of TO BE.
All in all, this is a wonderful application. If you are looking for an application to translate sentences or paragraphs, look elsewhere. However, if you know the language, this application should serve as a wonderful tool.