For what it is, namely a brush-tipped alcohol marker, it's amazing for its price + value. It has a great range of colors and the bag is sturdy and compartmentalized. The numbering system is quite strange, and you can see it most clearly with the swatch cards provided.
I love the cards Ohuhu gives, because it's much easier for me and fun to fill out. Although despite that, some colors were out of order, like the warm greys going 1, then 9, then 3. There was also two BG3's, one without the 'II' and different colors. With the darker greys, especially the 8 or 9's, they're almost as opaque--or just as--the black. I understand why, but 6 of these slightly different undertones feel somewhat unnecessary. A cool, warm, and neutral tone would have been fine, if you don't like using pure black. Other than that, some colors, like R13, don't match the color system at all. Other than that, these are awesome to add to my collection.