I bought a bunch of these panels. Good thing about them is that, considering their price, they do a good enough job.
The main problem for me though is that, they don't match in color. Some of them are darker than the others.
And also, for some of them, the edges are not evenly cut, i.e. on the same edge, it is cut on a valley in some points and on a hill on other points. In fact, you can see this problem on the first photo of the product!
I contacted Thomann about it, and they sent me some replacements, but the replacement items also had the same problems, so I gave up.
All in all, if you are going to have them on camera, I think you should elsewhere.
But if you don't have them on camera, they do a good enough job (considering the price).