i thought the uni duvets were pretty rubbish at keeping you warm, and also very thin, but i guess thats just my opinion. i brought my own one down from the very beginning, as did a lot of other people i know (more girls tend to bother with this than boys...). as for keeping the uni ones, i put it underneath my sheet to make the bed comfier and warmer. they're also handy to keep under your bed for when you have friends coming to stay...