I've got dewey, parker hale, some sinclairs and some home improvised guides. Probably some others if I look around a bit.
In the end, they don't do much more than stop the patch from falling off, though some do protect from dribbleing solvent into the bedding to varying degrees. Guides have a bigger inside diameter than the bore, or you'd never get a jag through it. Since it is bigger than the throat, it can't protect the throat from the rod. Its like useing a culvert to guide something into a garden hose.