Very good for its price.
But it has been very convenient for cold coffee at work, and for transporting it in the car as it fits in the car's cup holder.
In hot temperatures, the lid only lifts slightly due to the temperature.

It does not have a smaller diameter at the bottom than the previous glass from the same company. It may even be a few millimeters larger. So if you have the previous model (350ml) and it does not fit in the car cup holder, do not get it for this reason under any circumstances.

The only positive thing is that it fits in the car cup holder due to its double diameter. But overall, complete disappointment, as its sealing is non-existent. I didn't notice (and I don't think it mentions anywhere) that its closure is not screw-on, but snap-on. So the first day I used it for hot coffee and put it in the side pocket of my backpack, it made a mess. Obviously, if it's not waterproof during simple transport, in case of an accident it doesn't provide any safety, so it's completely useless...
Update 20.04.2024
After several uses, all I have to add is that I wish I could remove the one star I reluctantly gave. The sealing is non-existent. Even if the drink is lukewarm, the lid comes off its place and leaks occur. In addition, the lid will never be cleaned from the coffee residues after 5-6 uses. Overall, stay away!

Quality product. Attention to detail and with the short metal straw. It has not been tested to keep drinks for many hours because in 2 hours at most they have been consumed. Very convenient shape with the narrow bottom to fit in more car cup holders. Large capacity and very reasonable price. Not dishwasher safe or microwave safe. The lid after some uses does not clean fully from coffee residues. Attention, I do not evaluate it as a leak-proof thermos bottle but as a reusable thermos cup for everyday upright use. It is not suitable to put it in a bag, for example. It is for drinking your coffee in the car, for example