I think they're very good and outstanding for a first attempt. I don't agree that you always need to get the whole burst in the frame -- that's a compositional issue and not always important or wanted. #7 and #8 are my favorite.
The problem I am having with fireworks images (my own included) is that they become boring (no matter how technically perfect) unless there is something else in the frame to add interest. This requires positioning yourself to get that extra something (e.g. a city scene, a crowd scene, etc.). That's what I'm going to try for next year.