I haven't cut it as some people write.
I have absolutely no problem, it tidied up the mess with the cables and everything is fine.

As the other kids write, if you get into the process of cutting it... goodnight! I sat for hours trying to burn it, but nothing happened. Better something else.

For 4 euros, it does its job. It is true that if you don't cut it carefully on the edges, it opens up. But for what I needed it for, it's fine. I cut it into 3 pieces and it was just enough. Also, the nice thing is that at any height, you can leave a small gap in the scratches for one of the cables to come out, as not all of them may connect at the same height. If I see that over time the fraying worsens at the cut points, I will update. For now, those points are not very visible because they are behind the furniture.
EDIT
Indeed, if you cut them, they wear out quite a bit over time

It didn't work for me at all. If you cut it, it frays and becomes a mess. The Velcro is very weak, resulting in it constantly opening. Its only use would be to protect small children or pets from exposed cables. I definitely wouldn't recommend it for a CLEAN organized office.

I bought it to organize the cables (as the popular song says)....
Simple, flexible, and nice, you wrap it around the cables you want (and stick them together with the scratch it has), in my case I cut some of the last part because I simply didn't need it anymore and the job was done.
Cables from speakers, mouse, keyboard, mousepad (rgb), etc. that end up in the PC were easily accommodated without any issue, I will choose it again.

Very useful for reducing the cable mess in my office!
I have 2 monitors, speakers, a microphone, a camera, and a USB hub and I gathered them all!