I prefer the quadcopters from
http://3drobotics.com/, since they are open source.
Last time I was in Detroit, we spoke with a few guys staying in our hotel that were actually doing all the aerial video work for Transformers 4. After getting a chance to look at their 4- and 8-rotor copters, I developed a major interest in these things. They definitely can provide some amazing footage, but are next to useless if you don't have a proper gimbal mounted to the bottom.