I really enjoyed the change of pace from other anime. If you don't feel like watching the characters scrounge for food or money, or observing every new item or skill, this may not be for you.
The characters have extremely mixed but distinct personalities, something more reminiscent of reality then many other tv shows. I feel anime as a whole tries to push single or double character traits/personalities even on main characters, and the variety of traits displayed by each character is uncommon among anime. This a quality I find to be rare in anime, and I'm glad to see one with personality development, and even change as the story progresses.
The artwork is wonderful and again, rather unique; it's picturesque and tinted like watercolors, but the 3D animation isn't the greatest, (shown in large group movement/fight scenes).