Ok.. so I made the plunge for the deluxe Shure e500PTH's (think that model # is correct). Trying to figure out the different fittings. I'm using the standard black rubber fittings and wondered if anyone out there who users Shure's earphones uses the other supplied fittings and why? I know there's the rubber coned one, the yellow foam ones, and others but haven't figured them out Any insight is appreciated....