Split bottom allows for easy installation, and hold fimly around the Go Pro when tighened.
Both side holes are large to allow easy access to both sides of the Go Pro.
The holder bracket places the holders center of gravity towards the rear so in the unlikely event that the case is loose, the camera weight is more likely to fall backwards rather than forwards protecting the lens.
Sides are thick to give extra support
There is an additional rim round the rear side allowing the Go Pro 3 Plus to fit snugly inside.