I recently completed this scenario in a play-by-post game led by the inimitable GM Hmm.
Play this scenario!
Yes, it is hard. Yes, it's possible to experience perma-death. Yes, in some ways it may feel "unfair" in the way it challenges and breaks with normal expectations. These are not necessarily bad things.
I've purchased and read through the scenario as well as having played it through. I can certainly see that it needs a skilled GM. We had one.
This scenario excels at building an evocative environment and telling a superb story, a fitting end to the Scarab Sages plotline. As a player, you will need to be prepared and you will need to pay close attention. But success is ever so satisfying!
This is not a scenario that I would recommend to novice players or GMs. It's easy to see how it will run longer than a standard 4 hour slot. It is ideal for the play-by-post format, and I will probably run it in pbp.
We had a party of 6, with an APL of 9.83. We were: elf oracle 11 (me), 2 x human fighter 10 (both two-hander melees), halfling druid 10 with large kitty, oread spiritualist 9, human skill-monkey 9. Three of us were scarab sages.
Rather than go blow-by-blow, I'm just going to offer some “sage advice.”
Prepare like your lives depend on it – because they do.
Do your darndest to find as much information as you can, both in the briefing and during the dungeon segment. There is risk – you can mitigate that risk though.
There are (imho) optimum strategies for dealing with the combats. If you find those strategies, this scenario becomes much easier. (Though still not easy).
This is a scenario that really rewards skilful play.
ETA: I have just completed GM'ing this in play-by-post. It took about 9 weeks, and I go at a fast pace in pbp so that really confirms this is a big scenario. Players really enjoyed it, as did I. We had a few PCs drop below zero hp, but no deaths. As I noted above, the scenario rewards skilful play; and my players did well.