Full disclosure: the author is a good friend of mine. That said, I would genuinely recommend this book to Jewish history, theater history, and Jewish theater history enthusiasts, as well as to anyone who, like me, enjoys learning about any subject if it's described expertly and passionately.
The topic is less niche than it sounds. The author does a good job of situating the Vilna Troupe within contemporary popular culture, as well as within time and space - no mean feat, given how much they moved around! I loved the stories about how different towns reacted to performances and to the Troupe's growing fame, as well as the endless debates that prominent intellectuals had about the quality, meaning, and impact of their shows. (Never change, intellectuals!) Plus, you know, backstage theater drama. Any theater history has to have at least a few love triangles and affairs and elopements!
There's something bittersweet about following the rise of Yiddish theater as an art form and the growing acceptance and mainstreaming of Jewish culture, knowing what is to come. The author deals briefly with the Holocaust, at the very end of the book, and even that short chapter is a punch to the stomach. The book is clearly meant to be a celebration of a vibrant community with a big impact on the world, and it is, but one can't help mourning all the people and organizations that might have helped keep those memories and traditions alive.