All the following refer to the medium size.

I have bought these several times, and usually they were very decent and not inferior to the branded ones you can find in supermarkets. However, sporadically at first and more frequently lately, I have received a product that does not match the packaging. 1) It is clearly a smaller size, I would say small, as they barely fit, 2) it has a noticeably thinner absorbent material, and 3) there is a visible difference (for the worse) in the quality of construction.
Now I can easily recognize these batches without having to open the packaging. Because in both cases the packaging is exactly the same while the content differs in size (smaller and thinner underwear), in one case the packaging is more stretched and in the other clearly loose with an apparent shortage indicating smaller content. These problematic cases can be returned, and in my case, since I have a plus subscription and have not paid for shipping, I have not been burdened with unnecessary shipping costs.
Overall, I would say that if you receive the correct product, they are excellent and do not fall short in any way compared to the branded ones that cost twice as much. However, if you receive the defective batch, they are practically useless.
I have now tried the bodycare and libo extra, and I would say that both of these slightly fall behind the "proper" Hellenic care. However, they are a very decent alternative, with libo extra marginally surpassing bodycare.