Seen them on line. Seem to have a niche of their own, but as I have battery recharging capable equipment and mutilpe options for cooking already I haven’t looked into them more than looking them over on line.
They intrigue me, if I get one I’ll get you a review. I could care less about charging a phone (LED flashlight is another story), but the TEG powered fan to force air into the combustion chamber seems a good idea.