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This was a gift for my partner, and he very much enjoys it! It's good for about a single cup of tea or coffee, so if you like to carry a lot this probably isn't for you. If you put boiling water in in the morning by lunchtime it is a comfortable drinking temperature, so it definitely loses heat throughout the day, but not too badly for if you want to drink it in a few hours time.
I got this because I love penguins. Once it came, my kid claimed it as his own. It holds a decent amount of liquid and we use this to hold his hot chocolate whenever we go to the mountain. Even at nearly freezing temperatures, this holds his hot chocolate hot for a pretty decent amount of time. After a full day of snowboarding, it cooled down enough to be the perfect drinking temperature. I also like how it doesn't leak, so you can just close it up and throw it in a bag and not have to worry about it.