This review is based on a skim reading only. I am the author of the Traveller5 World Builder and take a keen interest in wilderness rules.
I am impressed. This supplement has a clear structure for quickly imagining and bringing wilderness situations into your Cepheus Engine or Traveller game. Accessible tables make travel and encounters easy to set up.
But it doesn't limit your imagination, providing concrete numbers for scales of maps and times that are easily adaptable to your imagination.
It also has a fantastic (and concise!) explanation and history of our beloved isocehedral world maps including a great projection of Earth onto one, the best visualisation I have seen that helps us make sense of it.
Definitely worth the very cheap price.