Bests & Worsts Reviews from Amazon

I received my Yeti 20oz with Mugslider lid. Looks great, well built. But after a hour or two, coffee is cold. While driving, the coffee will leak past the lid, and proceed to drip, all over your cars interior. I was hoping for something better. I also liked the information pamphlet that can with the cup talking about liquid viscosity, and how cold liquid is thicker, than hot, so hot liquid will have a tendency to leak around our Mugslider lids. Here's and idea, how about making a lid that doesn't leak when you put hot liquid in a cup??? I digress, TLDR don't buy if you want to use it for hot liquid i.e. coffee.