I bought mine a year or more ago.   Sure a stainless steel liner that kept coffee hotter longer would be great.   But it at least has a good snap down spout cover on top that helps keep the heat in.   Being retired, I use mine daily at home and it sure beats putting a coaster on top of the mug to retain heat better.   And with the spout "snapped" shut, you can turn it upside down and it doesn't so much as drip.   Rubber on outside does give you a great grip also.   And it fits under my K75 without removing the drip tray.   I just bought another while they're still available.