It's great although I wish that duvets had small pieces of material sewn into all four corners that would make it easy to attach your duvet cover to (duvet covers come with two small material pieces at each corner to attach to the duvet itself.  If there are no material pieces on the duvet, you are forced to bunch up the corner end tightly and wrap and tie the pieces from the duvet cover onto it.  You need to do this because if you don't the duvet will shift around inside the cover.