Agree with Kenneth, they're generally not brilliant for fireworks, the quality is not very good in low light, very washed out colours.
The slow motion feature is great, but will only really work in daylight experiments, at night the camera tends to get overwhelmed by the change in brightness and can't adjust in time. You can see this in the video from the AGM, only the first small effect is really any good:
Also an earlier video from the AGM shows the firework display filmed on a GoPro (except the set piece at the beginning). The wide angle is great for getting the whole display in where you don't have the distance, but the quality is nothing like what I've seen from a decent SLR camera...
This was the GoPro Hero 3 Black (not the new 3+ model).