Colonel Sahib, The reason why is because a weekend school is deciding to use the tas-heel series or IQRA books for their Islamic studies program and they asked my opinion on it. Personally, I'm more in favor of material from ulama that I know, plus I wanted to get some reviews, pros and cons on it from people who used it before. A pro is the format is very simple to read and understand and the content increases according to book level but one of the down sides that I see is most of the weekend students come from a Shafi'i background the tash-heel fiqh series is from a Hanafi fiqh.