I read this book re-translated from English to Greek and I would say that the essence of the Tibetan teachings is still there (and I think would still be there after several re-translations as this is the way it works with the spirit of "wisdom"). Furthermore, I think that reading this book and complaining about the "bad translation" work means you at least kind of miss the whole point. But it seems that some people do have a problem with the translation so I would suggest that if you are looking for a book that will help you learn the Tibetan language perfectly, this one might not do (I'm not sure about this actually). Buy it only if you are looking for a book that contains several techniques and tips that can be used complementary to your own efforts in meditation in order to help you reach states of less and less ego (and into "nirvana" or call it whatever you like, the name doesn't change the essence). The way it works is that many people have took the journey out of their ego for many thousands of years, like you are, and them speaking of things that you also personally find while meditating might help you, working somewhat like a "map" of already discovered territories.
To be practical though, if someone actually has read this book and has also read of a better translation (which I doubt since this is a unique collection of several Tibetan works), then please do suggest of a better translation than this one, otherwise, if there is no better choice of translation, I surely recommend this book for all those modern "yogis" out there. And to be honest, I don't really think that such a book would need a recommendation by me, because even if it had only 1 star it would still sit there from above laughing at our ignorance; I'm just writing this review for those few of you who are looking for a really good book and are about to be discouraged by looking at the reviews here.