Isn't the legality of drones for personal use still in question? I thought while a key case was dismissed that it was still a battle? While it isn't overly different than aerial photography from airplanes, helicopters, powered paragliders, etc. other than a actual human is present with the device taking photos...
Advantages for photography of planes and helicopters are still clear where you can cover significant ground and achieve higher quantity of shots over varied landscapes. These are nice because they offer the ability for lower view points and less obtrusive presence... Kind of a one trick pony though. You can only have so many in a portfolio unless it is all you do...
It's a lot of money for a good setup as well; unless you just go with a gopro and want video or do the spray and pray. Biggest use seems hobbiest, aerial video, and real estate marketing.
For me I'll stay with the good ole Cessna with door off and gyro...