Individuals who have read Solzhenitsyn's own autobiographical works and open letters might not need this book, but for most readers it will be a good introduction. It has the salutary effect of prompting one to go and (re)read works such as The First Circle. Pearce doesn't go into depth in discussion of Solzhenitsyn's books, but says enough to quicken interest in them.
Pearce shows affinity between Solzhenitsyn's positive ideas and those of people such as E. F. Schumacher (Small Is Beautiful). The critique of Enlightenment progressivism and positivism isn't detailed, but there's enough to remind me of writers as otherwise diverse as Phillip Sherrard (The Eclipse of Man and Nature), Russell Kirk, and the author of Ideas Have Consequences. I was also reminded a little of C. S. Lewis's prophetic novel That Hideous Strength, where Lewis presents a distinction between Britain and Logres, as I read Solzhenitsyn as quoted by Pearce, on the souls of nations. Familiarity with these writers -- who are often not known, or well known, to persons who presume to speak of their ideas -- can help one to understand where Solzhenitsyn is coming from.