I haven't been logged on here in over a year, but I wanted to give my two cents on the demo. First of all its fantastic. I love the stages, the characters, the physics. Everything is nearly perfect. That said I do have a couple suggestions:
1) Biggest complaint of all has to be Zelda's new B> attack. While I like the idea of giving it a different use, keep in mind that this is a Melee veteran and shouldn't be so drastically changed. Maybe allow her to have both types of fire (the new one by canceling?)
2) Some of the new stages musics aren't right. I would look into picking some of the weaker tracks (25m for example) and replacing them with Dream Land 64, Fourside (if its not already in. I can't remember), Metal Mario 64, etc.
3) I haven't played as C. Falcon yet since due to time constraints, but please tell me his chain link sound when he runs is gone!