Coming from a 8-10 euro one from Vikos (which I filled with hot coffee at 06:30 in the morning and by noon at 16:00-16:30 it was still warm), I decided to go for something branded with good reviews. The watermelon is a scam. Let me explain, as I write this it is 10:30 in the morning and the coffee is already lukewarm to cold, so .........................
The 27 euros were wasted.
In the end, only Stanley is the solution for cold or hot.

One of my best purchases. It is relatively heavy, but it retains the temperature much better than any other similar product

Awesome thermos, I bought it for €22.95 on plus deals and it's worth it and more. It keeps the water ice cold with ice cubes for at least 2 days outside the fridge. I take it everywhere, from work to trips. In terms of size, it's quite big at 700ml, so it's more ideal for water.

It keeps hot beverages warm for at least 5 hours at a good temperature. It does not leak during transportation or use (it closes very well). It is definitely a high-quality construction!

4 stars, because after two months of use, the rubber band on the lid became loose. This results in having to squeeze it into place every time before closing the lid. Otherwise, it leaks

It is really good, worth its money. In cold drinks with ice, it keeps for many hours, in the fridge the ice cubes were intact the next day! In hot drinks, it keeps for less time, but it is perfectly normal. It really is worth its money...

and few are the 5 stars... at first I was hesitant because of the price... it's a bit expensive but almost half a liter is not a small amount... it keeps cold water cold easily for 24 hours in the shade and hot water around 18... it's worth its money... get it with closed eyes.

Awesome design and very well constructed with a great touch feel. However, the price-to-utility ratio is poor as there are much cheaper thermoses with significantly better insulation capability.

I have been using it for almost a year with hot filtered coffee. It keeps the coffee hot for about 6 hours. It is relatively easy to clean although the tilting system requires a good scrubbing, and internally the coffee has left marks even though I haven't used a hard material (wire) for cleaning. The biggest heat loss occurs from the lid, especially when the thermos is not in a vertical position on a table.