At first they are yes. The steering is an on off procedure so you have to get use to the timing. I have yet to see one with real time steering.
There are some expensive tandem rotor helicopters that can lift quite alot.
cell phone uav
http://www.youtube.com/watch?v=Q9PfyY-TCaA
lifting 6 pack
http://www.youtube.com/watch?v=4sLh9...eature=related