This is an incredible game with incredible value.
Stars Without Number is presented as an "old school" style game. And, it lovingly lives up to that task with familiar elements of old school D&D. But, this is not just an old school game. For those not interested in the recent Old School Renaissance movement, don't ignore this game!
The text is clearly written and imaginatively conceived. This is science fiction role-playing at its finest. There are wonderful tools for creating your own galactic "sandbox" of stars, planets, factions, and adventure ideas.
The system features a simple D&D-esque style, but with many clever nods to modern game design, including simple, versatile skill system and a simple, flavorful psionic system. The rules also include an easy, but engaging, starship combat system. Finally, the faction system is great. The GM can create several factions that then "move" in between game sessions to give the universe and dynamic feel. Player Characters can affect these machinations, and even start their own factions.
My only gripe with the game is the presentation. It's graphic design is flat, but completely readable. Otherwise, the content, passion, imagination and helpful tools are top notch.