Yes, it's quite interesting seeing all the negative feedback. To be honest, I don't quite understand it.
I've purchased both the Super Nt and Mega Sg and have been extremely pleased with them. They're extremely high quality and strike a great balance between providing an authentic experience for the console while being reasonable to use with a modern TV. And to be blunt, aren't even an unreasonable price when compared to the alternatives for making the original hardware usable with similar fidelity and features.