I read the other reviews because I was looking for a very thin duvet insert. Some people complained that this was too thin or lightweight, so I thought it might be what I was looking for. Although it is fluffier/thicker than I was looking for, it is very lightweight (the king size is only 4 lbs), not too warm and the fluffiness makes my duvet feel very luxurious. To tie into a duvet, I folded over the corners and sewed them firmly, resulting in a hole for the duvet ties. It only took a few minutes 

Pros: Cannot beat the price, very cushy without being heavy.
Cons: None so far.