There is already a long thread about this product.
I was curious as I use a 25m ethernet cable from server to streamer and read the review in Audiostream. At least the first paragraph or two. The reviewer talks about the sound of a digital product as if it’s an analogue product.
With regard to CAT8, it is more expensive as it has bandwidth 300 to 400 times that of CAT5, and CAT5 could carry a 3gb file with 1hr of 24/192 audio in a matter of seconds. CAT8 is a cable designed for extremely high volume commercial data transmission and requires different and more expensive shielding. Someone said elsewhere that for audio CAT8 is a bit like putting a jet engine in a lawnmower. I rather like that analogy.