The plastic piece with the locking mechanism has leaks and for no specific reason a piece inside broke, rendering it useless! Two water bottles became useless....

Quite good. Sturdy construction. And the bottle is nice. It keeps drinks cold and hot. It is easily washable without smelling afterwards.

Very good and honest. It keeps our little one's water from 100°C to 50°C for at least 12 hours, doing what its description says. Sometimes, if you fill it up all the way, the pressure releases the lid and the water cools down faster. If you fill it up to 3/4 it's okay.

We bought it to have hot water for baby formula... very good, worth it compared to other expensive products

I use it for cold water in an office space. It keeps for a few hours, nothing impressive. It doesn't help that in order to drink water, you either have to unscrew the entire lid or press the button and have a slow and dribbling flow. Obviously, it is bulky. However, it is a metal thermos with 1 liter at a low price, so in terms of value for money, it wins if that's what you need.

It keeps tea warm at an external temperature of 10 degrees for 7-8 hours, as I tested it. It can keep it even longer.