A unique Moroccan WHS - there isn't really anything else like it in the country. It's interesting to observe as you approach it and see how the structures have been built against the mountain. Once you're inside, you're able to see much more detail - little bits of hay in the mud bricks, helping it stick together. Although there were some shops on the lower levels, I didn't find the touts too aggressive and it's much quieter the further you go up.
It's not the easiest place to get to if you're trying to do it independently. I stayed overnight in Ouarzazate and negotiated with a taxi driver to take me out there, wait, and then bring me back. They're quite used to this trip but you have to negotiate hard to get a good price! :)