wait until you find out about the miracle of insulation
Wowwwww I've never heard of that before ?
Of course, insulation does not keep things at the proper temperature. If I get a latte from Starbucks, for example, it's about 180º. That's far too hot to drink. If I put it in a well-insulated mug, I'll just have a far-too-hot beverage for hours. I don't want that. I want a drink that's a perfect (for me) 135º for as long as it takes me to drink it.
Don't think that's worth spending the money? Then don't. But don't make stupid, snarky comments when you don't have one and have no idea what you're talking about. As you can see from the dozens of comments in this thread, everyone who actually has one absolutely loves it.