This is a lightweight and insulated mountain bottle that keeps hot drinks hot for a little while (about 4 hours). Every Sunday morning I skin up a nearby mountain with friends. I pour hot tea in the thermos around 7:30 am, drive to the trailhead and skin up in 20 degree temps until 10:00. The tea is still hot. After skiing back to the truck the tea is typically luke warm.
Sure you could carry a vacuum thermos and keep hot drinks hotter longer, but the thermos would weigh more and will generally hold less liquid.
All in all, this is a sturdy and lightweight insulated bottle that does just what I ask of it.