The biggest challenge in writing about Augustus, other than managing his multitude of names, is how to stand out and offer something fresh for one of the most documented portions of Graeco-Roman history, both in terms of primary and secondary material. One big help is that Goldsworthy had been working up to this through his last two books, and it was probably hard not to turn to Augustus after writing about his (adoptive) father and his fellow triumvir-turned-archrival. He is good about being clear about what sources say what about Augustus and how reliable they are. Although I didn't learn anything particularly shocking, his synthesizes his research well and the narrative flows easily. He manages to be accessible to the ancient history newbie as well as the wizened scholar, although the latter may be thirsting for something more niche and in-depth.
To return to the names, Goldsworthy does not use the name "Octavian" in his narrative, although it occasionally appears in the sources he quotes. In fact, if I had to point to what distinguishes this book from other other works on Augustus, it would probably be the careful attention to names. Now, the downside to saying "young Caesar" in lieu of "Octavian" is that it can be a little jarring for readers that are used to the Octavian-Augustus dichotomy. He does impose a few ground rules on himself, though. For example, his adoptive father is always "Julius Caesar", and if readers keep that in mind it helps with the Caesar or Caesar question. Names are also important in other ways. Most obviously, Goldsworthy divides up his narrative into parts named after what name Augustus was using at that time of his life, swinging from Gaius Octavius to Imperator Caesar Augustus Divi Filius Pater Patrae (basically, Emperor Caesar Augustus son of the divine Julius, Father of his Country, nothing fancy). He is good about noting when a source is far enough in the future to "mangle" the titles a bit; although we retrospectively see Augustus as the first Roman emperor, he never classed himself as one (there is a subtle distinction in the office of Emperor which developed much later, and the title of Imperator). Goldsworthy correctly assesses the programs of Augustus as those of a man who attempted to both "restore" the Republic and develop a new structure of governance. How Roman history turned out in the future clearly was not as Augustus envisioned it.
It looks like I'm going to have to get back to the original Caesar and Mark Antony and everyone's favorite Egyptian queen to make the trilogy complete. If they are as absorbing and comprehensive as this book, it should make for a good time. As for this book, all I had to do was walk downstairs to the stacks and pick it up from my own library. If you are not as fortunate to run your own library, fear not. These books are widely held and readily available from most every public and academic library with a slightly-above the poverty line budget. Check out Worldcat to find a library close to you.