Exped down is shear luxury!
I use it both for ground dwelling and inside my hammock - it gives all the insulation I need even in the snow and frosts.
Hard wearing, comfy, warm, light enough .... but not all that small to pack away - but then I do not go lightweight or tiny pack trekking these days
I also use Multi Mat self inflating mats - which are bulkier and heavier than the exped but do the job fine.
Roll mats - for masochists only these days IMHO!
When I started camping your matress was made from your spare clothing, then it was open cell foam mats, then closed cell foam roll mats were invented, then self inflating mats, then down mats.
Each time I initially thought that the new mats were for wimps ...then tried one and was converted
I would be loath to give up my down mat now!
Tonight I will be under the trees in luxury... my down mat under me keeping me warm and comfy!