The advenutre was imperfectly written (I couldn't easily figure out where doors were, and area 5 was totally missing from the map), but we had a good time anyway. The high skill levels of the PCs compared to the gnolls we were fighting allowed a lot of cinematic stunts. We particularly liked Kyle leaping onto the armored wagon while it was moving, climbing to the top without being seen or heard, and then sneak-attacking the driver from the top.
The gnoll fights were generally very one-sided, since they could only hit the PCs on a 20. But lots of fun.
I've been looking more closely at the treasure tables, and it seems that my treasure concerns about 2 Nth-level PCs being the equivalent of 4 (N-2) level PCs are more or less accurate from that superficial estimate. There are still problems of specialization, of course, but this could work well as an alternate mode of play.