If you need an online buy, ebay intermittently has them. Usually not the best Buy It Now price, but it's online. I ordered my 21 and 15 from a place that does
online price quotes, they email you back, and then you have to make the order over the phone.
Regarding the color: I think the Equation guy said that it was a type of copper automobile paint, as used in certain luxury cars. Personally I'd be happier with a charcoal color, but whatever.
Regarding the fit: Gahh they hurt me for days. They had to sit on a large object for a while to make the metal give a bit.
Now that they're stretched out, they are pretty nice. I am not going to call them 'comfortable'. They are not going to win any contests there. But
after tens of hours of stretching they are not '
uncomfortable'
any more. Oh, the italics.
Regarding the foam: The RP-15 has a layer of thin foam stuck to a ring of dense foam. If you carefully remove the thin foam, you will
very, very likely find it to be a unilateral improvement. I've heard that removing the dense foam ring is not as good an idea, but cannot speak of it myself.
The RP-21, sans-foam, becomes more sibilant in trade for some other improvements. I've actually had a good experience replacing the RP-21's foam with the RP-15's thinner, smaller disc of foam. It leaves a sort of crescent moon shape uncovered, so some of the high frequencies pass through without any muffling. YMMV, as always.
Edit: Woo! Didn't even notice there was a page 2. Some of this seems slightly out of context, then.
Anyway, yeah, the RP-15 is dark in trade for its excellent bass. I think I'm going to get a chance to loan my RP-15 for an acquaintance's ATH-ES7, and my RP-21 for his Alessandro MS1. Gonna be a li'l cage match, yes.