Rum River:
I have one of the plastic ones that snap onto a 1911 and it is functionally very good. However, I quit using it because it mars the surface of the gun. I put it on brightly polished Kimber Gold Match and was a bit distressed to see the scuffing on the frame. I was able get most of the marring out with some Simichrome polish.
After that experience I considered other designs and decided against the use of any of them. Instead, I found a source of low cost range brass. I pick my brass up, but if I lose some, I don't sweat it. Fortunately I use 45acp. Unfortunately I don't like to shoot 45 indoors because I tend to lose a lot of brass at indoor ranges.
Some guys in the bullseye league use the ones that look like a fishing net mounted on a heavy iron pedestal. They use them indoors and out, and they are the only kind I've seen at bullseye matches.