I'll start right off by acknowledging that this edition is riddled with typographical errors. They seem to increase in number as the page count increases. It seems as though the publisher ran a manuscript through an OCR routine, and got bored fixing its mistakes about 1/3 of the way through.
Oh well. This is still one of the most important books I've read. I've read the opening few paragraphs before I bought the book (and they make a compelling argument), but I was immediately and profoundly influenced upon reading the whole thing. The initial arguments changed my view of the value and nature of a jury trial, while the entire work profoundly affected every aspect of my outlook of government, politics, and even the (classical) liberal tradition.
The first section seems a little long-winded (and, eventually, redundant), but Spooner has a purpose in emphasizing and re-emphasizing the key points, before moving on to scholarly analysis.
Some of the legal history may be uninteresting to those who are not lawyers, scholars, or deeply interested, but it kept me engaged. In fact, while I found some of the details dry, I found the overall perspective offered on Anglo-Saxon Common Law to be immensely fascinating.
Even if legal history isn't your thing, I can't advise skipping anything. Only by reading the work in its entirety, I feel, can the scope and magnitude of Spooner's argument be fully grasped. Many of the historical trivia later show themselves to be relevant, and many of Spooner's points only have their full effect in consideration of all the others.
Spooner has convinced me that trial by jury, and only trial by jury (properly implemented), is capable of restoring and maintaining liberty in the face of the de facto power of a majority.