First of all, I don't understand alot of the negative reviews noting that they 'didn't know what they were doing there' or 'what their motivations were'. The first tennant of the Society is to explore. Frankly, I think it's refreshing that a scenario offers you a chance to do this off your own initiative and not via a briefing.
I like the obstacle course introduction at the start and my players were genuinely curious about what had happened.
With regards to the Sci-Fi dip in the Fantasy world. My table were divided on this, some liked it, some less so. Personally, I liked the sudden jolt of it as it takes you heavily out of your element and adds a new element to the adventure.
I thought the NPCs were interesting and I enjoyed GMing them.
The only thing I felt let this adventure down was that the final encounter has quite a daunting, fear inducing setup, but it's actually abit of a pushover for a fairly combat capable party. The first sci-fi style encounter is much harder IMO. After that the scenario kind of trails off, with no really interesting reveal or wrapup.