Well, first of all I have something similar to that, but I don't carry it. I believe in the KISS principle, so having something electronic, that needs to charged is complicating matters. Matches have worked well for many decades. A magnifying glass, or a piece of ice made into a concave shape will start a fire. The old bow friction method works too. It would be fine at a fixed location, not so much when traveling. They are interesting, but I wouldn't depend upon it in a survival situation.
