To tell you the truth, that depends.
Some people have cloned the Chenming cases and not all are created equal.
While some Antec, Enermax, and Chieftec cases are in fact made by Chenming, other are not.
It depends on the case. Highest quality will most likely continue to be found in the Antec cases. Chieftec and Enermax have pretty high standards for their Chenming cases as well.
If your question is, "Will I get the same quality as an Antec/Cheiftec case if it is branded Chenming?"
The answer is maybe, or maybe not. It depends on the configuration that was ordered from the Chenming factory.
If quality is important, I would ask for additional info on the configuration of the case, the gage of the metal, the number of fans included, and the model number in order to compare them.
In many cases some of the Chenming models are the same, and in some cases they are not.
You would not beleive the sheer number of Chenming/Antec/Chieftec/Enermax clones that were not of the same quality that we saw in the computer markets during our time at Computex.
Not all cases are equal. - Chances are if the price is a lot less, so will the quality as well.