We got cheap ones for £12 from Tesco, they work perfect, I wouldn't see any reason to spend a lot of money on fancy ones, I don't see them doing anything different.
Not sure it matters much. They all work. Some are lighter than others. I have down, I didn't ask what language it spoke. Only pain is how the filling always works it's way to one end after a while, no matter what amount of shaking you do.
I love my wool duvet. It drapes round my body so no draughty gaps. Best duvet I've ever had - and I've had very expensive down, cheapy microfibre and midrange duvets.
I've just bought a feather and down duvet. £89.00. I loved it and then bought a flannelette duvet cover and used it for the first time last night. I had the cosiest night's sleep in a long while.
Friend has very bad skin on her face which drove her mad as she tried everything to get rid of the spots and blotches. Turned out she was allergic to her down pillows and duvet. She bought microfibre and her skin cleared up within the month. Have always used microfibe myself and have no complaints.
Ours are microfibre, like ratter I buy from Tesco or Argos, we keep the same tog all year and it's fine. I don't see the point of splashing out on something you have to dry clean regularly. If it gets very cold, we stick a blanket on the top.
Well i prefer Goose Down Or Goose Feather duvets.. tog 13.5 they are ideal for winters and also useful for a chilly autumn or for cold homes. Goose feather and down duvets have a high fill power and provide warmth and comfort whilst being very light.