I do use gopro alongside a dslr for video. Iancoombe, nice footage, especially underwater. To me the colors (out of water) have a yellowish cast. Don't know if this comes from the settings in the cam, foggy lens, or did you do something to them in post processing?
EDIT: seems that at least part of the problem is my screen
here, so probably no worries in your production.
Livia, excellent! Have watched your vids on youtube. The kite shots are gorgeous. Do you only use gopro for all shooting?
Here's a video from one of our last weekend trips this season. Some gopro shots there.