The secret to the Backbone is the spike at the top of the holster (at the rear sight), not the hook at the bottom. The hook at the bottom is merely a last ditch option which requires one to drag the holster rearward against the pocket in a slow and awkward way. Any pocket holster that is designed to be "waved off" is a no-go for me.
The top spike however is the shit... It immediately grabs onto the pocket lining and holds itself in place as the gun is drawn upwards in a natural ergonomic draw motion.