Good but not fantastic
But, if you keep tweaking the same character’s lines (my example is Morgan Freeman, tweaked 5 times) he begins to sound Australian and Arnold Schwarzenegger just sounds like an average American bloke.
As I have said in the title, the app is good but not fantastic. However, if the developers keep working on it, the app could become the king of voice generators and I will gladly change my star rating to a 5.