Not being a really competent pianist, I bought this more as an experiment in using my Kindle for sheet music and I must say I am a little disappointed, although I cannot criticize Dan Coates' arrangements. I suppose it is expecting too much to get a whole 'A4' size page of sheet music on a 7 inch Kindle and be able to read it on a piano music stand in real time.
I do have a Kindle app on my desktop PC and this displays the music in real size, but, of course I cannot put my Desktop Monitor on the piano music stand. I have not found a way of printing off the music into hard copy, either! This is probably prohibited by the Kindle small print somewhere anyway, but it has taught me a lesson not to expect too much from sheet music on a Kindle. I would be open to any advice to get around the problem, because the idea of getting a repertoire of sheet music together on a Kindle that was readable does have merit!