Chinese carbon clinchers - cheap but safe?
First of all, you need to rid yourself of the idea that "It can't be top-notch if it's made in China". Don't let all the cheap junk that comes out of China make you think they don't manufacture top-quality products.

When you buy Zipps, you're not just paying for the decals... free-market competition sees that this doesn't happen, at least not much.

Name-brand stuff is generally a bit more expensive, not necessarily because the brand can get away with charging more, but because the product generally passes through more middlemen, partially due to said name-brand being less specialized.

If someone is selling "just like Zipp" wheels for $500, corners are obviously being cut. But if they are asking $1500, chances are they're probably just about as good as the Zipps.

If there's no brand name at all, that's a bad sign. They're trying to avoid accumulating a reputation. I would never buy anything new if they didn't at least have an (English) website.

So to sum it up, if the wheels are significantly cheaper (like $500), they're either heavy or dangerous. Or both.

If the price is believable (more like $1500), it may be worth it if you do a bit of a background check on the company.