I enjoyed running this adventure a lot. The combats were really close due to some low rolling on my party's part. My major complaint is the sandstorm in the middle of the adventure lacks guidance on what the NPCs do - they come accross as completely hopeless which is worrisome for people who apparently make the journey often.
The final encounter is sort of shoe-horned in with the party having no real way to avoid it without getting into another big fight where they are on their last legs.
It seems that I have a lot od negatives but this module is great for everyone, first timers and experienced DMs alike.