My low rating is for presentation, not content. This story has always been a favorite--big ideas acted out between interesting individuals. I consider it one of Gordon Dickson's best and was happy to see it in Kindle format. I'm highly disappointed by the poor manuscript editing in the Kindle edition. ("Airear" for "aircar"? Really?) I'm loathe to spend more money on Kindle editions if the quality of this book is an indication of things to come.