Another thing is the settings you can play with on the GoPro. Choose Narrow or Medium field of view instead of Wide angle and you'll help with the issue of the deer or turkey looking really far away. We use them for duck/goose hunting a lot and you can wear the head strap mount and hardly notice it's there. Best footage though seems to be from fixed position and let the camera roll. You can even mount them to your bow itself on the stabilizer or riser.
Low light is terrible though unless you have sky as the backdrop - even then it's hard to see incoming birds so that low-light buck cruising through just at end of LST will be tough to capture clearly. Love the GoPros and you can use them for what you're doing, just keep some of this info in mind. I have the Hero2 and want to upgrade to the 3 - black edition with the remote, etc. The burst shots are really cool and you can even capture your arrow in mid flight... pretty neat stuff.