MAC Sheer Mystery Powder ($60.00 for 0.56 oz.) is described as “an ultra-fine, super sheer, and very sophisticated pressed powder … “Mysteriously” silky-soft in texture, glides on to give skin a velvety matte, slightly luminous and altogether flawless finish.” There are only two shades available: Light and Medium Plus. They used to release a shade called Dark Secret, which was more appropriate for darker skin tones.
I only picked up Medium Plus, so I only have a swatch of that one, but hopefully it will be helpful enough to show you the texture and look of it. I would recommend Light for NC/NW15s and 20s, possibly 25s if you are definitely NC/NW25. I would recommend Medium Plus for NC/NW30s and 35s. I think it would be too light for any shades higher than NC/NW35.
The formula itself is a very finely milled, silky smooth powder that applies incredibly sheer. It is best used as a setting or finishing powder, because it does not offer coverage, but it will set your foundation or help to mattify skin. It is not completely matte in finish, but it is semi-matte. I like it, and I think it’s a good pressed powder, but it’s not the best one I’ve ever tried. I don’t know if it’s that much better than MAC’s Blot or Select Sheer Powders, you know? I do like that it looks very natural, and it’s practically impossible to overdo. It doesn’t look powdery on the skin, even on drier areas of mine.
The compact itself shares the same multifaceted look as the perfume pendant, but unlike the pendant, it is made out of hard plastic, rather than metal. It feels very lightweight when held, which makes it appropriate for traveling but less so if you want that luxury feel. In the past, this powder has always been housed in a heavier, sturdier compact. It will hold fingerprints like nobody’s business, though.