The book Eglei Tal was written by Rabbi Avrohom Bornsztain and deals with the 39 melachos of Shabbos.
I was wondering what about this particular book is unique? Why would a person learn this as opposed to the Mishna Berurah, Aruch HaShulchan or other such works that also deal with the 39 melachos? (I suppose another way to ask this question could be- what did the author contribute to the body of halachic work [other than his particular psak on any given subject?])
(I am assuming that there is something unique to this book other than the authors particular psak.)