The books are good. There is only one volume, but the English-formatted, i.e. read front to back, is a series of small monograph discussions of the first 100 pages or so with some general exploration of themes and could be more tightly edited, but has much of use. The second half, Hebrew-Formatted, i.e. read from Back to front is a mixed English and Hebrew Haggadah that is nicely illustrated and has good fonts for both Hebrew and English text and is quite usable with its own areas of exposition by annotated text.
The work is well worth the price.
For the uninitiated in Passover, the Seder means order, as in the order of the setting and its components.
It does not mean the order of its clarity of reasoning.
Much of a Passover evening is devoted, ideally at least, to contemplation of the underlying meaning of Symbols, texts quoted in the Seder and what logical unity there is to the whole.
The purpose of the prayers, questions, songs, accoutrements and the meal are often discussed at length and to no complete conclusion. This is reasonable as a full conclusion has yet to be reached in 2000 years that everybody (at least those interested in the business) can agree to. Multiple works out there have various takes on the course of the evening's events and all have some seeming validity. Often the points of views and the conclusions can be quite contrary.
A favorite part is the 4 Questions: "Why is this night different from all other nights"
There are answers to be had which employs a good part of the evening. This is a major focus of quite varied theses. I can count out some 45-50 discrete ones that I have read thus far.
The nature of annotations and the stated explanations, at least in this as in much of Commentaries available for Mishnah or Talmud, are subjective. There is ultimately no single correct answer or even manner of thought and there is an advantage to having many similar works to peruse to understand the complexity of what is a Seder.
This work is a worthy member to join many others of its ilk.