While I personally am a fan of micro-dirigibles as opposed to the (IMHO) wasteful helicopter-type UAVs, this is certainly an awesome version of the latter. Its multi-rotor setup enables some serious agility, as you can see in the videos. If you’re filming, you might need some serious image stabilization, although it’s easily good enough for recon or aerial photography. There are several cool mounts for popular camera form factors, and I’m sure with a little customization you could have it drop water balloons on the kids across the street.
They start at around $15,000, so they’re not really hobby machines, and add-ons like GPS-aware hovering and a video-enabled controller make it more robust (good). I’m reminded, however, of the Manhacks from Half-Life 2 (bad). Keep your crowbars handy. More pics below.