The quality is great. You have the option of downloading with regular quality or at higher quality but to be honest I could barley tell the difference. Some of the readers are better than others so listen to the sample and see if can listen to that voice for a twenty or so hours. It is the same reader you would get if you bought the book from amazon.

Try your local library. Most public libraries have a decent selection of audio books you can download and listen to for free.