The volume is apt to be of less value to Proust scholars, or even serious readers who have read the biographies by either Carter or Tadie, or the critical works of Roger Shattuck, or others (both Carter and Shattuck have essays in this volume). The best essays in the collection tend to be those that are more introductory in nature. The weaker essays tend to be those that are more specialized and focused on specific issues in Proust.
Overall, however, I encourage anyone needing an introductory work on Proust to consider spending some time working through the essays in this book.