I bought just one of these to see how they compare to the main well-known brand. 
 
From initial inspection it does look/feel every bit as tough and there is one BIG advantage... 
 
The cable connection points are so clearly labelled (1,1+,2,2+) in white, on the outlet point where you can read them. 
 
It's just common sense - why don't others do it..? 
 
I'll be buying a shedload of these soon as I make up all my own cables these days and have a few hundred yards of speaker (4-core) cables to produce after Christmas.