I picked this module up shortly after it was published and thoroughly enjoyed reading it. I loved the idea of such a powerful and dangerous environment, and (being a King Kong fan) loved the specifics of the setting.
However, we never played it. We only ever had couple of PCs within light-years of 18th level, let alone at the power needed to survive the Isle.
It seems that I generated some new characters of appropriate level and started them through this all on my own as a sort of test run, but I don’t think I got very far. (I used to do that sometimes as a way to play when no one else was interested. Sad and lonely, I know, but I never had problems with it.)
Anyway, it occurs to me that a lot of what I liked about this module is finding its way into my Forbidden Jungle setting, and I wasn’t even aware of it. As James says, it’s very much in the mold of Lost World pulp adventure, and that is exactly the vibe I’m going for in Forbidden Jungle. With that in mind, I’m going to have to dig my copy of WG6 out and go through it. I’m pretty sure I still have it.