Hi, I am new here, 1st day actually. And my purpose is this. I wanted to ask if someone has ever used those COPY/CLONE type of Samsung Galaxy S3 or S4 from China and mostly what I see online is from Korea. The price is like 1/4 or less of the original. The physical features is almost, i mean almost, the same. The specs also are the same as what is posted but I worry. So did someone ever tried to use it? How about it's speed and performance? Please lighten me up. Thank you very much.