For those planning to start adventures in the 2nd edition Spelljammer setting, this book is rather useful.
You can set up new characters specific to the campaign setting, as the book contains new race, class/kit, proficiency descriptions - but also describes the workings of space based organizations and even has some useful tips for DMs on setting up campaigns.
You'll definitelly need the Spelljammer boxed set for your campaign, but this little booklet is a nice addition to that.
Furthermore, it is practically tailor-made for being print-on-demand: It's almost entirely black and white with mostly line-based graphics. It looks rather good.
Some graphics here and there have a slight blur and the occasional colors are a little off, but I honestly don't mind that.
All in all, a really good, but maybe not a must-have product.
The main reason I'm reducting a point is the slightly damaged state my book arrived.
[4 of 5 Stars!]