Has anyone used one of these or something similar? Premier Chick Brooder Heating Plate - 10" x 10" https://www.amazon.com/dp/B018ZUHR2U/ref=cm_sw_r_sms_c_api_POaGyb50SYNBK I was looking into the mama heating pad method and we figure that's going to cost at least $50 in materials (mostly the heating pad itself). And these heaters get great reviews. I've seen 3 different brands and they all have great reviews. Any thoughts or comments on them?