Test the product for yourself, many people write such rubbish in reviews. The reviewer was most likely overloading the device by a mile. Ripple can only mean overloading or a faulty capacitor on the output of the device. If I read the reviews on the equipment I have, then I fly really junk. But hey! It looks great when I put my foamies in the air at the park and many people and children come and watch and talk to me while I fly.