This supplement provides a fully fleshed-out campaign setting for the White Star RPG, though it can certainly be used with other games with a little conversion work. The setting, as described, has a very retro-sci-fi feel to it, obviously inspired by Flash Gordon and the like, and is set within our own solar system without FTL technology (though, given the flavor, as you can guess Venus is inhabited by a psychic race, Mars by a red-skinned warrior race, etc.)
As a campaign setting, it is quite useful, and can accomodate a wide variety of play styles--Star Marshals in space, Buck Rogers space opera, and so on. It also contains two new character classes, the Gunslinger and the Scientist (both of which seem well done to me), and even a bonus adventure to get you started. All in all, if you want to run a White Star game but don't know where to start and find the described flavor of this product up your alley, you can't go wrong in purchasing it.
That being said, the product has one large flaw I feel I must mention, namely the fact that it was written in a very amateurish style. There are many errors, and while most seem to be typos (indicating a lack of good editing), there are also awkwardly written and short, choppy sentences which make it clear the writer needs more polish as well. To be quite blunt, I find this unacceptable, and it reflects what I see as a problem with many small RPG publishers, namely that while they may have good ideas they don't put enough effort into producing what looks like a professionally written and edited product.
[3 of 5 Stars!]