I don't know about this kind but I know about the ones that CB sold. When I tried them the one with the shortest prongs is what was comfortable to wear. At night it was excruciating. The prongs dug in bad enough that it caused abrasions after one night. I tried filing the points down and that helped but, didn't really do anything to keep things from coming out.
When I was testing I tried the medium points which were the most I could stand when soft. Even with this I could still get out if I really wanted to. If you’re looking at this as a 100% security I'm not sure it will work if you don't want to live with cuts.
Is this the one you were looking at? http://www.lockeduplove.net/cb-6000-poi
If they are then these look worse than the ones CB sells and I think the problem would be intensified. I can’t believe they actually tell you how to sharpen them more!