I received the Ion mug from Home Tester club and I am pleased with the product. I warmed plain water about six times to remove the new appliance smell and needed to charge it once to keep it desired temp. To allow me to keep my coffee hot enough to feel fresh I had to make sure the mug was on for warmed, must be careful when doing so because the cover does spill some and the on switch is on the bottom, a handle option would be awesome. Over all I am pleased and would purchase and recommend