I see these things being used extensively to cover such events, and even the recent Winter olympics, they're everywhere. I was recently on the West coast of Scotland and hiked to a (fairly) remote beach to do some photography, the only other person there was flying one and I spent most of my time with one eye on it, just in case. I hadn't realised how big (and noisy) some of these things were. I was very impressed to see the operator bring it to the hover about a foot away from him so that he could make an adjustment to the camera! Not sure I'd want my digits near one with the rotors turning....