This is exactly what I was looking for in order to play Classic Traveller/Cepheus Engine solitaire. I purchased the printed cards as well as the pdf. The printed cards are printed just like playing cards, and the print quality is excellent. Each card is double-sided and easy to read. The color scheme used for the SciFi cards works well for me. The included SciFi Adventure Guide is also very helpful with ideas on how to use the various elements of the card. The examples included in the adventure guide work well on their own, but can be easily modified to fit your needs.
The pdf quality is also good; however, I did not want to print and cut out the cards. Self-printing can be done if a person does not want to purchase the printed cards, but I prefer commercially printed cards to doing it myself on cardstock.
I'm using the SciFi cards in conjunction with Paul Elliott's SOLO for Cepheus Engine. The combination of the cards with Paul Elliott's SOLO has created an exceptional experience with my Classic Traveller and Cepheus Engine solitaire role-playing game. The narrative of the story has been enhanced with the use of these cards. They have certainly helped my imagination with creating an interesting storyline for my campaign.
I can see this as a useful tool for science fiction writers, as well as GMs who need ideas on the fly.