Just thought I would add a few things.
I have a 4 Sliver, not wifi, but set for one button recording (this is key for not running down your batteries)
When I get out of the truck I put the unit on my head and look at my reflection in the window of the truck to make sure that the camera is pointing in the correct direction. It is easy to have it pointing to high or to low and you miss some of the action high or low.
When hunting the camera is off until the dog goes on point or sometimes if dealing with pheasants coming to the end of a field I may turn it on early.
But once the action is over I turn off the camera. (remember I am set up for one button recording).
Generally a battery will last me nearly all day, unless I forget to stop recording for a while after the action is over.
The other thing is that you can't move your head around much. Looking down at the ground while walking, turning your head side to side really makes the video tough to watch. While it doesn't look like much to our eyes in real life, its really jerky in the video.
The camera will pick up a fair amount of what you say, good and bad....
I use Movie Maker to edit my videos. It works and is free.
Its really a lot of fun to go back and look at what happened during your hunts. How the dogs did, how you hit or missed the bird.
The video on you computer is much better than what you see when it is loaded on line.
Some of my favorite ones.
https://www.youtube.com/watch?v=vLvzRulm-tw
https://www.youtube.com/watch?v=wn9wyI5Jsn8
https://www.youtube.com/watch?v=DQBY75XYgP8
https://www.youtube.com/watch?v=iGTbOEwpF0g