For that price you can get a DJI p3p which has lightbridge, a proven gimbal, longer battery life etc. The main advantage this has it has it is a little more portable. I think they should have sold it for 500 bucks.
On top of that the field of view of a GoPro camera is too wide for a drone, DJI have a much more adequate setup. GoPro should have at least supplied a small lens that would fix this problem.
As for portability, assuming that one would be using each brand's backpack to transport each drone, they are actually very similar in size:
GoPro: 540 x 320 x 150 mm DJI: 447 x 318 x 229
GoPro would have a much better chance if they had entered the market at the right price (~500 USD) and emphasised the qualities they are known for - durability and reliability.
That's when the GoPro is folded in the bag?
Wide FOV - 17.2mm Medium FOV - 21.9mm Narrow FOV - 34.4mm