The creative team does an amazing job of bringing the world of Avatar to life in comic form. The characters are spot on in personality, mannerisms, and ideas. Bending, the act of bending one of the four elements to your will, is as visually stunning on the page as it was on the screen. The Promise delivers big on the humor and the action, which were such a big part of the television series.
The Promise is also a story of identity, not just for the colonists but for Aang, Zuko, and the others, as they find themselves adapting to the post-war world. This final volume does a great job of bringing together all the elements from the first two volumes, such as Toph's metal-bending academy, Aang's Fan Club, and more; what was such a great source of humor evolves beyond the jokes to become groups that really matter in the world of Avatar going forward. One of the highlights to the story for me was getting to see how the world of The Last Airbender starts to evolve into the world seen in its sequel, Legend of Korra. There's an internal consistency to the world and its growth, which I really like.
I heartily recommend the entire Promise series, if you've been craving more adventures of the original Team Avatar or if, like me, you wanted to see what happens to change the world so much between The Last Airbender and Legend of Korra.