Needs a lot of work to make it worth paying for
There are other programs available which have less quantity but offer greater clarity of voice and quality of pictures and, at a lesser price.
Positives:
1) there are a lot of topics covered.
Negatives:
1) the sound appears to be computer generated (not human recorded voices). the quality of the voices is so bad it almost makes the application unusable.
2) the pitch; tone; duration of the voice cannot be altered to make it faster /slower /clearer to hear.
3) there is no menu or settings to allow anything to be changed in the content.
4) the versions for both the iPhone and the iPad are different (the iPhone version is almost half the size of the iPad version - possibly there is less content offered).
5) the images used vary from good to barely acceptable (iPad 3 and iPad 4).