This mug isn't well insulated at all. Like the metal outside but not a fan of the plastic inside. Coffee only stays hot for half an hour, if that. Plastic also takes on odors, and that bothers me.

I like the rubber for getting a stable grip on the cup, since it has no handle. I also like the size of the cup. It's too bad I have to remove the drip tray to fit it into my K15, but I can deal with it.

In the end, this is not a travel mug. It's nice that it has a lid for transporting the coffee, but that's probably all it's good for. You'd have to reheat it when you got to wherever you needed to go, and that just defeats the purpose. 

I understand now why the price is so low. But this really isn't worth the money. I'll probably only use it when I'm cleaning my Keurig, to ensure safe transport of scalding liquid. My mug warmer keeps my drinks consistently warm, whereas with this mug, my last sip is cold. And my warmer cost about the same amount of money.