I have one. I am 6-1, 210 +/-, 36" waist, not a flat stomach but not a beer belly either. I can just conceal a 23, and then I have to wear the right shirt so it doesn't hang up on the butt. That is at 3-3:30 and a mild cant. That isn't the fault of the holster, just the physics/geometry.
The supertuck carries tight as anything and spreads the weight better than most. But it can't change the laws of physics.