The comic series is wonderful, continuing Aang's story with the others, which is a must for fans of the series and additionally explains how the world reached the form it is in Legend of Korra. The books are of excellent quality, I recommend the library edition that contains the releases of one arc (e.g., The Promise, The Search, The Rift, etc.). The first 4 volumes, if I'm not mistaken, are from the pen of the author and the last 2 are from others who are also decent. Regarding the price, I think in Greece they are very expensive, I bought one volume from here and got the others from abroad where it came to me very differently even including shipping and customs as one package was stopped. If I think that I am just a consumer and a business can get a discount, having worked in the book industry I know some things, I consider the price at 50 euros quite high. The product, however, is wonderful. If you liked the series, it's perfect reading. Additionally, it will also be nice for children when they are learning English.