I've used a couple including the Nemesis. The Nemesis has a lot going for it, but I have pants and shorts where the outline of my 442 is too obvious using it.

I have been a fan of Milt Sparks for many years and decided that I would give their pocket holster a try. Like all Milt Sparks holsters, they are expensive, and you have to wait for them. The results, however, were very positive. The shape of the revolver is considerably better concealed. I had a problem of the holster coming out occasionally on the draw. I learned that a slight rotation clockwise with my draw and this has never happened since.