The case is all plastic and it has a metal switch plate. The plastic is about medium thickness and doesn't flex much. It weighs close to the same amount as the Dell AT101W which I had sitting next to it.
The keycaps are ABS doubleshot but on the thin side. The two flip out feet are really tough to actually flip out, I'm afraid of breaking them when I try.
I'd say 7/10
4/10 if I include the build quality of the switches and the soldering.
I still like using it though, it feels nooice.