I am interested to hear some reviews. I have built multiple thermoelectric Seebeck effect (opposite of Peltier effect) generators along the same lines as this. They are very low efficiency (sub 5% most of the time) so they are best used as waste energy harvesting devices, which this device is. You cook with it and you generate a little power on the side. I will say that Seebeck generators have some definite drawbacks, mainly that they don't lat a long time because of thermal expansion and thermal shock, so they are best used in constant-on scenarios. That's why they are mostly used on remote gas and oil rigs for monitoring purposes (low power need, almost always on). Very low electricity output per size and weight. I wish them well, but I am not holding my breath.