They look nice on the outside, but bare kydex on the inside always makes me nervous. the first holster I ever had was an uncle mikes kydex that I used for IPSC production class shooting. within 3 months, I had worn the finish off the front of my slide from the constant holstering and drawing as the metal rubbed against the hard plastic.
does he have plans to try to line the kydex with some sort of felt? my safariland thigh rig that I used in the desert didn't put a single mark on the weapon in 12 months. it was a kydex shell with felt liner.