You wrote:
“Unless this is written by Messianic Jews for Messianic Jews what possible use is it? Why would anyone use a bible commentary written by unregenerate people? Talk about useless.”
No, it’s useful. I have only paged through it at this point - I just got it yesterday afterall - but I know it could be quite useful. The footnotes are filled with fascinating details and references to dozens of ancient Jewish documents. There are also a number of essays, tables, and a glossary.
I do not expect to learn doctrine from it - it’s written by “unregenerate people” as you say. I do, however, expect that I will learn quite a good deal about the cultural and historical contexts of the New Testament.
By the way, I do not assume that “Messianic Jews” would necessarily produce something much better than any good study Bible already out there. Messianic Jews are just Protestants with Judaizing tendencies. If I want the fullness of understaning about Christianity I first go to Catholic and Orthodox commentaries.
So, it's essentially a book of ancient Jewish history and culture organized by bible verses. I can see the utility of that. What contemporary sources do they use other than Joesephus, Philo and the Mishnah?