No one I've heard of (well, Zonet rings a bell, dimly) but that may not mean much. They probably use the same chips as well-known brands (it's an ADM5106 in the Edimax's case), and maybe you can infer something from similar products. Or not.
But with Newegg selling these at $28 for the Edimax (even though it's parallel only) and $41 for the Zonet, it's not exactly a big risk.

Our "cheapie" Hawking goes for more than that, and it's just a print server.
Repeat after me: I need a neeeeeew router... Either one would work as a replacement for my
dearly departed SMC Barricade. I really miss that built-in print server.
Randall