I don't think anything good about it. Apart from the standard anti-Semitic polemic, which innovates nothing, he insulted a number of people whom he had no right to insult, and reinvented a number of episodes of his own biography in a self-serving and mendacious way. If you wish to look into it, you can start here:
I read it online, in Russian. Well, in the late-Solzhenitsyn version of Russian, which diverged considerably from the standard language. I don't know if there is an English translation of it. I saw on a few occasions that people expressed the intention to translate it, generally as part of some anti-Semitic agenda, but I don't think that anybody got past a few chapters, since there is nothing particularly new or interesting in it, even (and especially) for anti-Semites, and rendering Solzhenitsyn's unusual diction and neologisms in another language is difficult.
Outstanding book by one of the greatest of Russian authors that should be required reading today.
Seconded.
thirded
There’s a difference between a book and its author (although I guess critical theorists would have something to say about that).