The book introduces Braille at Grade 1. It has a few exercises, which do get you to learn and practise what it's teaching you. Within the two dozen or so pages it has, I learnt a lot. However, whilst it includes letters, numbers and capitals, it does not teach punctuation. For me, the most annoying thing about the book was its style: The target audience seems to be middle school pupils.
In short it is useful for Grade 1 Braille learning but it doesn't teach you everything in Grade 1 and its style could be a little off-putting to adults.