I like the video, short and sweet. I think I'll get one. Light-My-Fire is my preferred ferro rod.
Regarding the idea of the ferro rod running out, I'd use that ferro rod in the handle as a back up. Also, somebody said above that they like their tools separate. Note taken, but this tool does a good job at having a small number of moving parts. Meanwhile, the moving parts look like they would be fixable by a 5-year-old.
By the way, if you have ever used a sharp knife spine to scraper ferro rod, then you know it makes a small scraper feel like a frail toy. A knife spine can shoot a shower sparks more easily, as the video shows, because it enables way more leverage.
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If you're reading this, it's too late.