If you are a super-scholar who likes to do word puzzles, you mike like trying to piece together some of the many fragments of the pseudo-psalms found in this book. I was very excited to buy it because I thought it would give me greater exposure to ancient Hebrew and Aramaic. But there is not much content. There are a few psalms (e.g. 154 & 155), part of an addition to Sirach and not much more.
I had some money to spend, but I wish I had not spent it on this.
Nevertheless, for the right person, I am sure it would be worth it. After all, it is certainly not the publishers fault that there are not many pseudepigraphic and non-Masoretic Psalms to publish. It would have been nice, though, if they published the actual psalms and texts of the Bible from Qumran so that one could compare them with the Masoretic Text- or at least if they published the Rule of the Community, etc. all in one volume.