I can't say, it's a good and worthy inverter, but due to my own mistake one of the two fuses burned out, and I thought ok, it will be simple, they had sent me 6 fuses with the package... As you can see in the photo, with great difficulty I even had to cut it! There's no way, it will be repaired but what's the point, guys, of sending extra fuses when the burnt ones can't be removed?
Nevertheless, I do not dismiss the fact that it is indeed a good machine.

its construction seems good, it supports the Watts it claims. It says 500w rms and it was tested with a 500w polisher for about two hours, it worked without a problem on the 4th speed out of 6, but I noticed that it makes some "gaps", like small interruptions. Maybe it's better not to operate it close to its claimed limit.
attention, the 1000w maximum it states is for startup power, meaning it can draw that momentarily

It worked effortlessly at 80% of the rated value for 2 hours without signs of fatigue (temperature). Well done.

On a smart bike trainer and a fan it provides, it doesn't struggle at all. It raises the temperature only slightly and the fan never turned on. It definitely can handle much more.

I had bought a cheap one for around 25 euros and after 8 uses the machine broke down, so I decided to try something a bit more branded... It seems to have durability over time, I found it useful for camping to plug in some electrical device like a television, and also during a power outage I turned on a power strip... I recommend it

Separately, it easily lifts a 700w drill and a corresponding angle grinder. It didn't heat up at all, resulting in the fan not activating at all. A plus is that it is initially quiet, which is important for automotive or camping use. Additionally, there are 2 fuses included, meaning they can be easily replaced if something happens and they burn out. It's great for its price, well done Bormann.

The fuses are stuck on the circuit board. If one burns out, you need a soldering iron to replace them.