I like the shorter and wider version of the Carter Mug, although I wish I could purchase a splash guard like the regular size. It's just a few mm away from fitting in my car's cup holder perfectly, but it stays put enough. Coffee stays very hot for a long time, and if I leave the cap off I can cool it down faster because there's more surface area exposed.
Keeps contents hot for hours. The Carter mug does not leak; it is easy to drink from, thanks to its thin edge, and is comfortable to hold. I like the grey color. The only downside is it does not fit in the holders in a car.