Do you like it?
Moczarski was jailed with Jurgen Stroop and wrote down his conversations with him. What would I base my decision whether I like it or not? What Stroop said before his execution or what Moczarski wrote down? There is a similar book I've read, Rozmowy z Leistem - hitlerowskim starostą Warszawy(Conversations with Leist - the Nazi governor of Warsaw), and again I have the same reaction.
I read Borowski years ago so I don't remember enough to comment.
If you understand Polish, there is a well done play or rather a television adaptation you can watch based on Moczarski's book and it follows the book quite well.