I tried a Daniels IWB for my Glock 20, and am very pleased with it.

What makes the holster unique is the position of the belt clip. It is over the trigger, not over the slide like other holsters.

This reduces the thickness for IWB, so much so, it is a much slimmer profile than a Blackhawk or Swiss Tactical. My P250C has a thicker profile in a Swiss Tactical IWB than the G20 in the Daniels.

The holster grip on the pistol is firm, but de-holsters positively.

It's so good, I bought one for my P250C as well.

I recognise an excellent IWB design when I see one. Because when I used to carry a Security Six, I would use a plain El Paso, remove the belt loop, and attach a leather strip to the holster just ahead of the trigger , with a press stud, to loop over the belt for IWB retention. The Daniels does exactly the same for my semi-auto, fits IWB the same way, and even has the option of a plastic loop with press stud.