You'll frequently find headphones with similar looks and specs. I can't remember which model they are cloned from but that's what triggered the interest in the Cortex CHP-2500. The OEM headphone market has been discussed a number of times here. Sometimes it's been worth the gamble, sometimes not. If I were on a limited budget and didn't have the amount of feedback that's here on the Cortex CHP-2500 I'm not sure I'd gamble with those.
The specs look good but there's no telling build or sound quality without a review from someone whose opinion you respect. You might want to find a review from a trusted reviewer before you get these.