I guess they're cool because they have their logo branded into the carts, and other details like the boxes that some, if not all, of their games came in.
NGD, I have a Famicom SuperVision cart with a multicart label. They're basically just another pirate company if you look at it that way
Speaking of SuperVision, I also came across a SuperVision Famicom to NES converter recently that I'm gonna try and get my hands on