I have TNW in my office (actually I have all the knock-offs in my office :lol
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When I tried TNW, I used scissors for the main bulk and then a 180 grit because the crystal file didn't work as well, but the 180 shreds the end. Sorry this isn't as helpful, but I got them to compare against Minx as they say they do the same thing. Essentially they are stickers but the adhesive and thickness is definitely different to Minx. IMHO not nearly as good but you would expect me to say that so I am probably not the best person to ask.
However, if I had nothing to do with Minx and tried them both, I would still prefer Minx as they are so much easier to apply. As I say this is my opinion which I am sure you would consider biased.
If I have helped at all - great!:hug: