I sold one. I got 4 chrome shells on hand and also some Red controllers (I take the circuit board from a Red controller since it has both black thumbsticks and black triggers which looks nice, the bumpers are still the red glow ones that comes with the XCM chrome case). It's a little harder to install than the red or black duos, plus the chrome shell costs another $30 plus shipping.
So the price is somewhere ~$30-$40 over the other duos. I didn't add the add-to-cart button becauase I was afraid everybody would buy them all at once and I would get behind on orders lol