If you are getting into quad and hexcopters have a look at this one that Atarix777 demonstrates. He has built it in a way to keep the cost down without sacrificing performance. It has a total weight of 2.3KG so it sure isn’t a compact unit! It is an FPV system which allows the user to view the image of the on-board GoPro. Check out the 11 minute mark for a nice flight around.