I've finished a couple of nuts with these files, and while they do work, there are some drawbacks, especially compared to Music nomad.
1. For me, no. 85 doesn't cut, it's more like polish. I think they didn't sharpen it correctly/enough
2. When you file a nut, the bottom part looks more like a wide U than half circle
3. I'm not sure why there's 0.75" on them, as there are not many strings of that thickness
4. Compared to music nomad, I have the guitar set so I've used only no. 46 from that set, it cuts faster and leaves a better finish. It can also cut deeper because the file is not wider than the cutting part. This is a really minor thing but again.
5. Again compared to music nomad, price isn't justifiable. 100€ for 6 widths, off of which one isn't usable. Better to buy music nomad ones, 5 pieces (if you need for 5 string bass) for 19.9€ a piece and enjoy working with the tool and the finish
They do work, for occasional nut making I don't see a problem, but if you want better for the same money, music nomad is the way to go. Comparing them with music nomad, I do regret the purchase