I am thinking of writing my undergraduate dissertation on Nationalism in Japan, and having never studied nationalism, I thought this book might be a good start. It is written clearly, and I can understand most of it at first glance; and the theories and criticisms are covered and explained systematically and comprehensively. However, I was occasionally left a little lost- this is probably best to read if you're doing an introductory course on nationalism as well. Reading it with no other guidance has left me slightly uncertain as to some of the explanations and opinions offered. I was left confused as to the author's intended audience- did he write for fellow theorists of nationalism, or a wider readership?
Still, despite such uncertainties, it has helped me to understand the intricacies of differing theories of nationalism and the concept of the nation, so on those grounds alone, it is worth it, I think.