I just saw UP today, and I wanted to give my review of it. It won't be long, and there won't be any spoilers. You should already know what it's about, so I won't spoil that.
Storyline: Excellent storyline. I thought it was wonderful. Pixar definitely did great. They started writing it in 2004 and I don't think they wanted to cut corners. Even if they did, they did an amazing job and I was astounded. 10/10
Music: BEAUTIFUL composition. This will sound cheesy, and if you're not a musician or don't have a strong love more music, you probably won't understand, but the music made my heart want to soar. It was wonderful. Not complicated, just beautiful music.
Characters: All were well developed, and I truly loved all the characters. No one seemed lame or stupid, they were all brilliantly developed. 10/10
Is it worth it?: Definitely. I would see this movie again. Heck, I would buy it. Definitely great. UP scores 10 flying houses, out of 10