I have a similar rig that I've used for years with various pistols ranging from the AMT DAO to the Kahr K9. I've worn it in the manner shown in the video for deep concealment and that works pretty good if your gun isn't very heavy. Works best with my PF9. I've tried it with the 1911, but with that large and heavy a gun, it's either too tight to be comfortable or too loose to hold the gun in that position for long (on me).
It can also be placed in position at your waste to use as a sort of makeshift "tuckable".
Versatile rig. I still have mine and use it. I think I might like that one better, if the material is as good as described.