GM'd this one today for the first time - was great! I had a really good time running it.
GM's be aware it takes quite a bit of prep time to get it right, probably 3 times as much as I'd do on an average scenario, but I think it's worth the time for how cool it is. Plus reusing it will totally pay off.
I will say though that the difficulty is certainly above average - at least was in what I generated. We had 6 players, many of them quite experienced, and an APL that was just barely low enough to stay in low tier. I was expecting them to breeze through but after a few good roles it came very close to a TPK. They pulled it off in the end though - no deaths.