“Does the job as advertised”

“Yes, it does keep coffee warm, and does so longer than the average coffee cup. It does not keep it warm for much longer than 40 minutes maximum and only then if you keep the top closed. It is unlikey any insulated coffee mug could keep any warm beverage hot to warm for as long as an insulated thermos bottle or something, so this is probably the best anybody can hope for. And, of course, it's a lot better looking and easier to use and have at the breakfast table than a thermos bottle.”