Sit n Go tournaments are very popular on the Internet, and Moshman indicates he has had good success following this system. The book is laid out logically, going from the start of a tournament, where the blinds are low, through the middle game and finally the end game, where blinds can often be very large.
Moshman's advice is all about controlled agression against the right opponent at the right time. It is not a magic formula to earning millions of dollars, it is more of a framework in the you follow the advice for different table conditions. For that, you need to make sure you can analyse your opponents by watching their betting patterns, where they are seated related to the button and what cards they showdown. He also advises very tight play in the first few blind levels, and I for one have improved just on that point alone!
You will need to understand poker principles and have a sound understanding of different types of player, such as tight aggressive, loose passive, etc. If you have this understanding, then the play advised is useful and effective against poor quality opponents. I think the variations that better opponents bring, usually found at the higher buy in tables, would scupper some of the advice here. But then, if poker were a formula, it wouldn't be such a fun and challenging game to play.
Moshman's writing style is a little frantic and rushed sometimes. Just when I think he is building up a point, he finishes it and then injects a load of hand examples. The hand examples are good, but they do not always follow the hand to the end. It is useful to know that sometimes, a certain strategy does not always pay off and why that might be. Yes, this happens in some of the examples, but not enough in my view. Harrington's books are much better at this aspect of writing, so if you are coming from reading those, as I did, you may find it a little frustrating.
Overall, a good foundation for being more successful than not in STT.