Having read the chapter version myself - yeah, it's that good.
Truth was, The Slumbering Tsar was too big to even browse in a weekend. Sure, you can flip through the document like some flip-book for grownups, but you will be kidding yourself if you think that even a dozen hours with an IV mainlining Starbucks Sumatra blend into your veins and a half-carton of smokes at the ready is going to get you through this tome with anything approaching even a passing level of familiarity. This book is so huge that you will find yourself just losing hours of time reading it, here and there. To put it in perspective, a typical issue of Pathfinder Adventure Path clocks in at 96 pages; however, the adventure itself is only about 45-50 pages. The balance is composed of introduction, ads, campaign/region specific background articles, special rules, short-story fiction, and yes, advertisements.
Vaughan's initial concept for Slumbering Tsar was as three books, loosely broken up by adventure region: The Desolation, an area of desolate and barren wilderness, the Ruins of the Temple-City of Tsar itself, and finally, the Hidden Citadel - the great temple to Orcus which provides the mega dungeon which takes up nearly half of the book.
When the sandbox nature of the encounter zones impact is taken into account and when the effect of the random encounters putting the 10 minute adventuring day firmly into the grave are added to that --The Slumbering Tsar Saga is often deadly. Going one step further, even the supposed "level appropriate" encounters are very challenging, too. Add all three of those factors into the mix, and PC death is something everyone should expect.
The payoff is sheer gold. The pages leap to life with encounters that feel markedly different from those presented in most other adventure products -- even Paizo's own Adventure Path series typically don't present most of their encounters with as much of an NPC feel as Vaughan does. The overall impression is often one of stat blocks of monstrous NPCs, not simply encounters with monsters.
The Slumbering Tsar Saga is a massive work with over a half a million words of text. The layout of the book, in 256 greyscale, is surprisingly easy to read and I enjoyed the 2 column format and font selection in both the heading, box text and main text and stat blocks. While the overall presentation of the book is necessarily less "gee-whiz" that we have come to expect from Paizo -- the book presents much better than you probably expect. The artwork, in particular, was rather well done I thought. The illustrations, while not excellent, are good to very good and the overall art direction in the book is far more unified in approach and impact than the hit-and-miss illustrations we saw in Tome of Horrors Complete.
In fairness -- and to the credit of Greg Vaughan -- the key to a great map is not simply in the presentation of the cartography, it's also in the underlying design of the map. Indeed, I've seen some pretty iffy maps from Rob Lazzaretti that have made it into print at Paizo. They are iffy maps not because of Rob Lazzaretti (he's generally a brilliant cartographer/illustrator) but because the original map turnovers Lazzaretti was working with were poorly conceived. That's the saving grace with Slumbering Tsar's stylistically challenged maps: Vaughan's map turnovers are crisp, make sense and are all highly serviceable. The last factor which contributes to the lethality is the aspect of Vaughan's design which I enjoyed the most: the foes are largely unknown and unknowable. Unlike many adventure products, Vaughan is constantly reaching for new monsters, new templates, new classes and applying class levels to monsters in a manner many GMs and players will be unfamiliar with. This means that unlike most adventure products, the players (as distinct from the PCs) usually never know what they are up against and never know what the foe's capabilities actually are. This aspect of the design adds immeasurably to the difficulty of the Slumbering Tsar Saga. If "knowing is half the battle", then the PCs start each battle in Slumbering Tsar on the losing side.


I appreciate dedication and detail... but the size of the thing is a turn off. It is too much to digest, too specific in its usefulness.