This specific product is not intended for professional use, but for personal use in order to transport items that interest you. If someone thinks they bought a professional tool, I don't know what to say. It is a cart for transportation, for people who want to transport objects for their shop without breaking them due to weight, and generally for simple use. Personally, I used it for a personal move with boxes and it served me well without any problems or reliability issues. I made around 140 trips and it was fantastic. It was used in an exhibition to transport tables, plastic and metal boxes of medium weight, and it didn't suffer any damage. Scratches are unavoidable and I consider it quite reasonable. It was truly a great purchase for the 75€ it was bought for. If you want a professional tool, don't get this one. Spend 300-500 euros and get something equivalent that will never die.

Easy to transport, opens and closes very easily. The large wheels are especially helpful on uneven roads. I easily transported a significant amount of weight (around 30, 40 kilograms) on an old cobblestone Cycladic alley with great ease.

Bad product, the locks broke after the first uses. Generally, it is not convenient. Prefer fixed iron ones that are for a lifetime

Overall, very sturdy construction. The 4 stars are because the wheels open as you push the metal base downwards, to a point where it is plastic. After many uses, this point will significantly wear out (metal against plastic, who will win...?), and the wheels will no longer stay open nor will the base stay down!
The problem in this case is the availability of the plastic parts (wheels and related accessories) involved in the mechanism and their price!
We shall see...

For its price, I consider it an excellent choice. We use it professionally for loads of 30-60 kilograms and it appears to be very durable and stable. With such loads, we have had 3 other carts break down on us, which claimed to withstand 60-70 kilograms. The wheels are also quite large, allowing for smooth rolling. Opening and closing it is very easy and quick, and when closed, the wheels fold and it takes up minimal space.
For your information: on many websites, it appears with different photos and specifications, which can confuse someone considering purchasing it. The correct photo is the one on Skroutz, with a wheel diameter of 175 mm and platform dimensions of 48 width X 35 depth.
It has a fairly large platform that covers the majority of transportation needs.

A very good and sturdy folding cart for a purchase price of around €50.
When folded, it becomes completely flat, as the wheels also fold.
It has a very good load-bearing quality.
Now, as for durability and weight, I can't say if it can withstand the 120kg that the manufacturer claims, as I have not needed to transport anything over 60-70 kilograms so far.