I've read it and think its a great module, but I've only been through it once.
We barely got out alive.
We had an ultra-high level party going through it- what would be termed "Epic" in 3.X- and nearly had a TPK. The problem wasn't the NPCs & critters, it was the party.
Generally, we tried to play smart. Resources were distributed throughout the party and nobody just went "TAB-TAB-TAB" unless it was clearly needed.
It was our first encounter with the Police Robots- at least 4 as I recall- and they looked tough, so we figured we needed a big spell to take them all down at once. Rather than having the Wizard do something, one of the other PCs- OK, White Lotus, my Ftr/Ill/Ass- used a Ring of Spell Storing to cast a high-level Delayed Blast Fireball set for max delay...
You know, so we'd have enough time to get away.
Of course, the robots were so insanely fast that they had closed to melee with us by the end of the next round, and were whaling away on us when the DBF went off.
It sure did kill all of the 'bots. It also sent several PCs into the negative and got everyone down to less than 30 HP. Since none of the ambulatory PCs was a divine caster, it was time to get out of there, heal up and regroup.
As you can imagine, each subsequent encounter on our way out was a LOT tougher than it would normally be, and by the time we exited, one half of the party was dragging unconscious bodies of the other half.
We never went back.
To this day, some 20 years later, the guy who ran the mage blames me for that mess. What he conveniently forgets is that it was he who suggested the use of DBF in the first place, and had his PC cast it, it would have had an additional 9d6 punch to it.