I ordered two of these duvet cover sets and have been using them for several months now. 
Positives: These duvets are so so soft and cozy feeling. It is almost like satin but it is cotton. They also seem to be maintaining their color. I wash them 2 times a week and they are still black as night. 
Negative:This super soft fabric seems to attract lint and small fuzz from the wash load. It is certainly anoying but nothing a couple of swipes of lent roller won't fix.
For the price i would purchase them again if needed.