I'd say it's a metallic wet-look shimmer, similar to foiling Goldstone, though the EDSF do not have any noticeable glitter. If you are unsure to what extent they emphasize skin imperfections, I strongly recommend that you try them in person.
Also, it is crucial that you know your face and bone structure to use the EDSF strategically to shape and sculpt your face using the right tools. A paint-on brush (189, 128, 191) followed by a buffer brush are essential. IMO, the 179 is by far the best choice as the angle lets you shape and buff at the same time. A flat kabuki like the 183 or a rounded one like the 182 were not my favorite for this SF.
You really want the most control you can get.