This review is based on a one-time readthrough which took about two hours. Also, I am very familiar with many of the previous BESM and Tri-Stat products, such as BESM 2nd Edition, BESM d20, and Tri-Stat, and let me tell you that BESM 3rd Edition is superior to all of them. At the core, it's the same BESM we all know and love, but it just includes everything from the previous editions and spin-offs and more. As for the differences: point costs and starting creation points have been expanded, making items is simplified and unified, damage is calculated differently, dice-rolling has changed from "roll under stat" to "roll 2d6 + stat", which is easier to remember and implement (none of that dX nonsense from Tri-Stat dX), and there's an official campaign setting called the Multiverse. For those of you who prefer simplicity to detail, there are several sections in the book where simplified ways of doing certain things are mentioned, such as not using skills or Variables (which are PMVs [completely optional] but given a different name) and whatnot. For those of you who prefer more detail, there are also treats for you, too, such as customizing attributes, expanded combat rules, and variable damage resolution (I especially like the ones that vary based on margin of success).
All in all, a very fine product indeed and I can't wait for my physical copy to arrive. Guardians of Order went out with a bang on this one.