We ran through this yesterday with a party of 5 9th level PCs and the 4E ruleset. I modified area three to become a slick, wet stone arch over a deep gorge. There was a caustic geyser beneath the arch and it was both challenging and difficult terrain. That was a meat grinder! The party fighter took two steps, fell prone and was blasted by the geyser. Several failed saves later and he'd taken 42 points of damage!
Yssah and her golem (I downgraded the standard stone golem from 17th to 10th level) were incredible foes. By the time the dust cleared, one PC was petrified, one was unconscious and had missed two death saving throws and everyone else was bloodied.
All told, it went over brilliantly! Everyone liked the use of the maps, commenting that they added a great deal of flavor to the game, much more so than my usual scribblings on the battlemat.
For the price, it can't be beat!