For some reason a quick glance at the CM website and i can't find any information regarding manufacturing process, quality, approval, etc.
Ordinarily this would be top priority for a company selling aftermarket, or OEM quality products.
Why not look at a manufacturer with a long proven track record of quality and motorsport application, for example OZ, or Team Dynamics that are generally cheaper. They might not offer replica VW, but there are some pretty decent wheels to choose from.
I wouldn't fancy cornering at 60mph+ knowing I've taken a punt on some cheap wheels...