I think it is essential for every Iranian to watch this TV series for at least one time. You cannot ever think of no encyclopedia of Iranian culture more complete and sophisticated than this one. This is an amazing, unbelievable and everlasting harmony of the best Iranian screenplay, director, actors and actresses, original soundtrack, edit, cinematography and every other aspect at their best conditions during their life. This will surely never happen again.
If you focus on the characters and search ALL the Iranian actors and actresses you cannot change ANY of them with the ones who take place in this series.
If you focus an the soundtrack, you will be surprised that how Iranian cultural music can describe and fit in every action, romantic, drama, comedy and thrilling scene so beautifully. This is the Only Iranian production that uses just this kind of music and its soundtrack is also a masterpiece by itself. ( compare with the best examples: Hossien Alizadeh works )
If you focus on the story ... Ooops! what am I saying? is there any better choice? God bless Iraj Pezeshkzad!
If you focus on director, no doubt it is the best of Taghvaei.
If you focus on converting the story to screenplay - in which Pezeshkzad has been ready and helping all the time - what better example in the world you can find?? Try reading the book several years after watching the series. During reading the voices will sound and the faces are in your mind all the time.
Finally, due to the political, economical and cultural conditions of Iran at that year (1976, just 2 years before revolution, years of common wealth and time to begin to know more about Western culture) and this magnificent set of elements and their admirable effort to make their best (which ALL of them were really successful in it) and the Iranian heritage of essay, the book itself; it is unique and it will never happen again...