I wonder about the reviews that some people write. I have been using it since 2019 for cleaning in my scattered fields and I have to say the following:

Pros:
1) Large fuel tank (approximately 1 liter) which allows you to forget about refilling and work for a long time.

2) It has good power for cutting and easily cuts grass with a thickness of 5-10 centimeters (e.g. thick grass).

Cons:
1) It requires frequent maintenance (changing spark plugs, air filter) which makes it uneconomical compared to other brands (e.g. Stihl, which I also have) unless someone takes on the role of a mechanic!

2) The screws easily come loose, to the point where the fuel tank fell off while I was using the trimmer! This means that every time (!!) all the screws need to be tightened to avoid surprises.

3) The handle has a plastic knob, which makes it completely impractical because no matter how tightly you screw it, it will loosen, so it needs to be tightened every 10 minutes while the machine is running!!! In my case, the handle broke after 1 year and I had to replace it, so its durability is low!

4) The pull cord is quite difficult to start the engine, as it usually takes around 5-10 minutes to start, so here too, the pull cord needs frequent replacement. In comparison to a Stihl trimmer that I have had since 2013, which has only had the engine head replaced after being stored with fuel for 1 and a half years! But until today, the pull cord has not been replaced, the Hyundai trimmer lacks in terms of quality!

Draw your own conclusions

I use these specific Hyundai grass trimmers professionally, knowing (as anyone can understand from the price) that we are talking about a second-class product. However, this does not mean that it is not worth its money, especially for amateur use, but also for professional use.
However, like any "second-class" tool, the person buying it should know what they are looking for and what they will get back for the money they will spend.

To be more specific, I would like to mention two things:
Positives:
1) Cheap purchase, you don't think much about it and if it breaks, you say: I will buy another one. Whereas if you have spent 500 euros, you think differently.
2) Powerful tool and in combination with a new head (costs 6-7 euros) to use thick nylon thread, it becomes top-notch.
3) Cheap spare parts (which can be both good and bad because at some point it just needs to be thrown away and buy a new one). However, it will have earned its money since a similar branded one costs 3 or 4 times the price of this one. And I doubt it, since I have worked professionally with many branded ones, if what will last me 1-2 years of hard work, the branded one would last me 6-7 years without problems.

Negatives:
1) Trimmer line. It does break easily and requires attention so that we are not "careless" and pull abruptly since it has high compression. If it breaks, replace it not with Hyundai but with another aftermarket one that is more durable.
2) Air filter. After a while, the screw loosens and constantly falls down and you have to search for it. If you use it without a filter and it sucks in dust, the motor will go bad. The solution is an O-ring on the screw that holds the filter cap.
3) The handle that we hold unscrews and starts moving back and forth. Annoying. The solution is to put a rubber band and screw it back in.

These are more or less the issues. I have bought 4-5 of these over the years, they all have the same problems. If you handle them with care, they are worth it.