We played thru it as a 5 characters groups, level between 3-4.
Be warned that it is a 3.0 module.
The roper is CR10 in the module but it's CR12 in the 3.5 MM.
Oh, and that roper as a Ring of Wizardry 1 as a treasure. Thanks to that, the sorceress can now cast more than 13 level 1 spells...