Hi, JJ....I have a super king Devon Duvet on a king sized bed. I give it a good shake daily yet I don't find heavy despite being large and I love that it keeps a nice temperature all night.
well went ahead and bought the wool duvet from Dunelm. Put it on yesterday and had a great sleep last night. Able to make the bed so easy. No lumps, bumps, billows and billows of highness.
Can't get over how flat it is. Will be good for my arms not to have to trail it across the bed.