I'm overwhelmed by the various apps developed by AppSimo. Vlingo is annoying as I have to type corrections no matter how slowly or carefully I speak. It defeats it's purpose. So, I came across AppSimo's apps. But, it seems that they are virtually the same. What's the difference between Voice Dictation (SMS, Email, etc.), Voice Dictation for Pages, Voice Assistant-Personal Secretary, Voice Tweet, Search Assiatant-A New Way... & iNotes Assistant? Some differences are obvious. However, if I can post Tweets with Voice Dictation (SMS, Email, etc.) why buy Voice Tweet?