I am very happy with my merino wool duvet! The light/summer weight is perfect for me and I prefer the size of the euro single for fitting a twin mattress (less material hanging over the mattress), although that's definitely personal preference.
I didn't notice any smell from the wool, which I've read in reviews of other brands. The only thing I wasn't expecting was the cotton shell does make a little bit of noise just due to the crisp cotton, but the more I use it the less I notice it.
Shipping was also super fast, which is always a bonus.
Looking forward to many more nights with my duvet!