Biggest drawback is that you still have to carry the actual recording hardware on your body somewhere....backpack, fanny pack. And that stuff is not hardened for the shock of running around, hitting the dirt....dropping. Also need to carry power for it as well.
Take a look at the one that I used the other day at the game at Avra Valley....footage is online linked at Youtube. Actual quality is better than what you see on Youtube though because of their crappy compression scheme to minimize bandwidth.
It's also half the price of that one and self contained. A little bit more cumbersome but oh well.