I have run this twice, will be playing it in less than a month via play-by-post, and have discussed it ad nauseum in the product and GM discussion. There isn't much else to be said. You will either hate this for the unfair odds, or love it for the incredible challenge. I choose the latter.
Most of this set is very specific in use. The set list highlights that there are over a hundred 1x1 tiles of various items. I personally have little use for them, and could have used more 2x2 tiles for pits and the like.
However, even the smaller subset of things I feel I will actually use is worth the price to have, and having those 1x1 tiles may come in handy somewhere down the line. The main complaint I have is the small number of certain types of tiles, but given the wide variety, the breadth of items is more important than the depth of each one.
There is so much to this scenario that is right, that it is a darn shame the wrong brings it down. I have played this scenario with my wayang cavalier, and read the scenario to prepare for running it in the future.
The plot is laid out in a sensible, if transparent manner. Each stage gives plenty of chances for interaction with the NPCs and exploration of the themes of wayangs. There is enough combat to suit the tactical players and built in characterization for the fights. (Being directed to be unpredictable and confusing was very enjoyable for my CN cavalier.)
The problems come from the vagueness of the story and the maligned verbal duel rules. There just isn't space to give enough fodder for the players to work with, a fault of writing constraints, and the inclusion of dense mechanics cuts that space down even further. Players need to be prepped for this scenario, a practically unforgivable sin for an adventure that needs to be accessible to players just walking up to the table for the first time. Assault on the Wound benefited slightly from not allowing 1st level characters and was still a black mark. To Seal The Shadow is stained even further by lacking that compensation.
I love this story. I hate the hoops required to enjoy it. This is one of the few scenarios I honestly never want to run.