Hi all, I had, last year the occasion to use a Gatewing x100 and honestly, it was a fantastic experience. OK... It's expensive. Around 15.000 €. Without, the software and the computer to process the end result. OK... it can not fly longer. But it depend of the altitude and the temperature and I was at 2000 meters, 35° and fly only 30 min.
But, it easy to install (36kg, suitcase and Ramp) and it's more efficient in comparison with an Aeryon Scout micro-UAV™.
i.e: My friend launch the helicopter but it fall dow due to a local tornado!!!
The end result below is compute with Agisoft Photoscan Pro that cost three times less than the Trimble Image Processing software.
http://uas.trimble.com/image-processing#collection-3
and it bring you an amazing result with 3 cm/pixels in a short time.
http://www.gisarea.com/topic/3137-agisoft-suite-software-x32-x64/?hl=agisoft
This is my personal point of view and of course we can chat a long time with this topic.