Excellent! My wife loved it and uses it daily at work to keep her coffee warm.
If the coffee is hot to begin with, it keeps it warm for quite a while, and if it is cold, it makes it lukewarm, so it is ideal for maintaining hot coffee, not for heating up cold coffee.
It has a wood texture and the bottom has a non-slip surface that feels like something between velvet and felt.
It connects either to the computer's USB port, a power bank, or a low-watt charger.

I didn't like this product at all. It doesn't keep your cup warm at all. The only time it does, is when you've drank most of your drink and you're about to drink your last sips. I've read several reviews and people were saying that you're supposed to pick a cup that allows heat to transfer. However, I've tried several cups and none of them seemed to work. Overall, my experience with the current product wasn't satisfactory.

It is small, convenient, and keeps the drink quite warm. Definitely, for €12, you can't expect miracles.

I liked this gadget, it is nice.
It keeps the drink lukewarm, not hot. I use two cups that do not have a completely flat surface, but it fits and touches the entire surface of the gadget's base

Good appearance compared to what is available. The main problem is that it is constantly lit. If it has a sensor, it doesn't work on mine. A longer cable would help if someone wants to place it further away from the computer. It's decent, but that's about it.

The first week it had good performance, kept the drink very hot. After a few days, it was just lukewarm!

I bought it at the same time and spent about the same amount of money as the "Ecolife Coffee Cup Thermos 0.37lt". The comparison is clearly in favor of the latter, because this product, as long as the cup is at least above the middle, does not even keep the coffee lukewarm, while it is strictly used next to a pc. On the other hand, the thermos cup keeps the coffee at a better temperature for at least two hours, and you can even take it with you if you want. As a result, I threw away the first one somewhere, and I bought a second thermos cup for the car!

Apart from the fact that in two different cups, one with a flat bottom and one with "feet," it doesn't even keep the coffee lukewarm when I lift the cup, it doesn't close automatically (maybe a defective product). Its functionality was thoroughly tested as it was connected to a 75-watt charger from Realme and a 27-watt charger from XIAOMI with exactly the same results... terrible

It does what it says, warming the surface enough. It helps with the aluminum plate. It has good results only if the cup has a flat bottom. If there is a gap between the cup and the surface (like all cups), the coffee stays lukewarm up to 2cm from the point of contact. It doesn't mention it anywhere, but it seems to turn off as soon as you lift it.

It does what it says. It keeps your drink hot. It has a diameter of 7.5 centimeters. They don't make cups with a larger base.

Everyone talks about lukewarm, maybe the USB port plays a role, meaning different in a laptop and different in a socket from a charger or a desktop computer. I connected it to the front ports of my computer and it keeps the coffees warm for triple the time compared to on a desk, but even after hours, as long as the coffee is below the middle, it keeps it easily at 40 to 50 degrees, you can't touch it when it's full with any means. Very nice with the wood and metal, it fits in all setups

Okay... rubbish, what can I say! I was excited about my new gadget for my office! Having read the reviews, I used the perfect cup. A magic one with a bottom that touches completely the "eye". It barely keeps the drinks lukewarm (definitely not hot) even in a time when the weather hasn't even gotten cold! As a fan of hot beverages, I will continue to search for my suitable mug warmer...

I consider it to be value for money. It keeps the drink warm, but not hot. This may be due to the cup I use (IKEA), which does not exactly touch the surface of the heater, although I don't think there is a cup that has a completely flat bottom.

It keeps the food container warm even. So at work you have two in one. And your hot coffee and your lunch at a good temperature for as long as you want.

I bought it as a gift and from what I learned from the person who uses it, they are satisfied - it keeps the coffee relatively warm, as long as the cup has a large bottom and touches the device

The best cup warmer I have found so far. All the others either smelled burnt or their rubber turned black within three months. This one doesn't do any of that and because it's wooden, I can place it on any surface. Its lifespan remains to be tested, but I find it reliable.

It is mainly used for tea (heats up more easily than coffee). You need to leave it for 5 minutes to heat up, but afterwards it doesn't have any problem. Although it doesn't heat up the drink if it is cold, it keeps it warm. Besides that, it has a good design and appears to be of good quality construction.

Just be careful when it has heated up enough, as the metal can burn your hand.

It keeps the drink lukewarm and slightly warm, but only if it comes into contact with a relative cup surface.
The surface burns if someone touches it with a bare hand.
Overall satisfactory base.

It keeps the coffee warm to hot. Simple little gadget, I've been using it for 2 months now and it hasn't presented any issues.

It keeps the coffee warm to hot, but you need to combine it with a cup whose surface is the same as that of the coffee machine, made of ceramic with a lid. With this combination, you will remain satisfied. The plate is so hot that it has no comparison to all the other nonsense that is circulating.