Here I have the last of this matte collection from HM which is Purple Metal. Purple Metal is very similar to the blue and the silver, it's matte, metallic and takes two coats and drying time is normal considering there's no top coat. BUT, the difference is that this polish is duochrome, the base color is of course this vibrant purple but in some lights the color shifts to a brown tone. It reminds me a bit about China Glaze's No Plain Jane, except that this polish actually is duochrome. For me personal I really like the duochrome effect, it feels special. However, in some lights the brown can look a bit dirty and disguise some of the vibrancy in the purple. However in many lights (especially with long/curved nails) the brown is visible in the edges of the nail and also enhances the color of purple on the top of the nail. So, if I recommend this? Oh yes.
The picture above and below have one nail with top coat and it indeed look great shiny too!