Every now and then when we are camping we hear one even though it's supposed to be illegal. It usually throws us for a second, then we realize what it is. I think the benefits far outweigh the drawbacks, so I wish the regulations were a little less strict. I have a pair of DJI Phantom (2 or 3's) in my office at work, but I don't know if they have ever been flown because we have a small farmers airport a couple of miles down the road from us.