Well, I had a gift certificate to REI and ended up using it on a new GoPro Hero HD960. Captured some footage from a couple days ago when I had the bright idea to ride my DH bike out there. I edited out all the huffing and puffing it took to get that beast up to the upper cheese/upper hairball saddle.
I don't really know what I'm doing and am still learning a lot about editing, so take that for what it's worth.
The first vid is just of Upper Cheese and using the helmet mount.
You were moving around on the bike pretty good, I almost got a bloody nose from your saddle with the chest mount footage. In this case, for Cheesegrater, I like the helmet cam better, it seemed more stable. But, for easier riding, I tend to prefer viewing from the chest mount, as long as it's aimed up high enough. Irregardless, nice footage, chunky looking trails, I've got to get over there. But first, I have to quit working so much.
I like the chest mount best myself. I like the lower perspective and seeing the suspension working as well as the operator working the bike. Seeing the saddle peek up once in a while is fun, too. Let's you know when you are really off the bike.
The helmet is smoother but to me mounting it higher, while in reality being closer to the true perspective of what the rider is seeing, seems to lessen the features as you pass them. Watch the video of LateDropBob on Geronimo and he's just sailing along smooth as silk. Then watch mine from the chest mount and it looks more like what the rider is experiencing.