This is a good module overall, with an emphasis on solving puzzles and avoiding traps. It's relatively light on combat, depending on how well the players do in figuring out traps and bypassing locked doors. I've ran it twice so far to good effect, though the party that didn't have Comprehend Languages was frustrated at times.

Pro: very imaginative room/trap design, well balanced combat and challenges.

Con: solution to some of the puzzles is fairly opaque; this can lead to frustration if the DM doesn't adjust to the players and/or characters. Some puzzles are nearly impossible to work out without access to a rare campaign-specific language. I recommend either encouraging players with access to Comprehend Languages to have it available, or otherwise providing access to the spell if the party composition isn't favorable.