Before reading this book, I read some of the Dalai Lama's other works, namely 'The Art of Happiness' and the compact 'Book of Wisdom'. The content in this book is somewhat more complex and may lose some readers due to its harder-going nature. However, it's hardly a challenge; it just may be hard to tune in to, especially if you're a light reader.
There are some useful tips and pieces of wisdom in this book, which is to be expected as it's written by a man who may be amongst the wisest on the planet. I don't think that this is the best Dalai Lama book, though. I'd like to say that that title rests with 'The Art of Happiness'. Therefore, if you haven't read 'The Art of Happiness', I'd suggest that before reading this. However, this isn't exactly a bad read - it's just inferior in my opinion to the other mentioned book.
Overall, though, a great book - definitely worth investing in.