I almost bought them but went with the gearwrench set instead
Now that the price on the Sunex has increased (currently at $99.35) the GearWrench set is, IMO, a wise choice.
http://www.amazon.com/dp/B00UM68NYM/?tag=atomicindus08-20 currently at $85.06.
Personally I prefer GearWrench impact sockets over both Sunex and Grey Pneumatic but own some of each. I'd buy US made Snap-On, Wright or SK but my pockets just aren't deep enough.
Although this thread is about 1/2" drive impact sockets IIRC many/most that insist that everyone buy only made in US tools quite often change their tune when it comes time to shell out big bucks when it comes time to purchase 3/4" drive impact sockets.
BTW Mainland China (People's Republic Of China) is a communist nation that practices capitalism while Taiwan (Republic Of China) is a capitalistic nation.