The principle is pretty old. I even found it in a survival manual more than a decade ago. I admit that itīs cool but it itīs very limited in use. So you may find items for fire starting that give you more value for the same bulk or price.
Iīd say it primarily has a toy value. It seems to work best when you least need a fire.
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If it isnīt broken, it doesnīt have enough features yet.