Hello, I might be a bit late to answer on your thread.
I have had a Sunsonny SK-K1 keyboard for about a year now, that I have bought when I was living in china.
The build quality is very nice, the top plate is made of metal, the keyboard has got a nice heavy weight, the switches feel nice, so far no problems with it.
The usb cord has got a textile sleeve, with two velcro straps for carrying.
So far I have no problems with it. I did not find any drivers on the website, but it does not need any, I was just curious about a set of functions (little running guys with a number beside them, but it seems it is some sort of turbo mode (for key stroke repeat)).
I have tested different keyboards back there, even compared to some higher brand of keyboards, I would say that for most it is more the branding that you pay for. Some of my friends owning higher end mechanical keyboards also approved mine after testing.
Concerning the switches, I have the illuminated black otemu (black keyboard, green backlight) no problems yet. For the keycap, they use the same as for cherry mx, so replacing any won't be a problem