My SRT is one of the black ones and the CD works great, IF you do it right. It will remove surface dust but not crud. Like FP I make sure the car has a good coat of wax and follow up with a detailer and microfiber cloth.
I have been using CDs for the last 10 years. Was skeptical at first, but I was won over after using it. It is the ultimate tool for white cars and great for everything else up to and including black....if you keep your baby garaged and are a true car nut keeping it clean. I usually have one in my hatch (along with detailer and MF cloths) If the temp is cool (65 deg F or less) you can use it right away. If the surface of the car is hot or you are in direct hot sunlight, I recommend against using it.
As mentioned above there is parafin wax (and oils, I think) in the fibers and they will streak on a hot surface. The genuine CD requires you to let it sit on newspaper for a day or so before using it. The paper will look all greasy when you remove the duster.
GREAT PRODUCT if you are a neat freak. Proudly used daily!