I don't deal in Islamabad and I also learned about the project via the newsletter. From what I have read and heard about it (after reading the newsletter of course), is that it is a good project. I asked a friend of mine in Islamabad to drop by and check out the development work on the project for me. He will do so in the next few days so I will share my findings with you.
Other than that, the thing I find most impressive about the project is of course 5% guaranteed rental income. That's just wow. I wonder how they're going to achieve it especially since most of their units are still under construction. What comes to my mind is that perhaps, they would just deposit your up front payment in a bank and give you interest. That kind of arrangement could work with someone who does not mind living on interest. Not too sure how Islamic that is, by the way.
And from what it looks like, I think the developer per se is selling the units. No agents involved thus far so...