I don't know about the Emmerson but my AEE has the gopro chipset (not the specs of the latest gopros but capable of good footage) and it came with absolutely everything you needed except a memory card, unlike gopro where the extras are extra, and for a fraction of the cost
However the 'box' gopro style is not ideal in paintball. Contours and bullet cameras are better suited for mounting on goggles or guns
Gopros etc can be mounted on a gun in front of a hopper without making an extra target if you wish, or as a sight cam - but note genuine gopros are offset, some gopro clones have the lens at the centre