The cotton is very soft. I think the buttons are MOP, but it's a very tough call. If they are MOP, they are among the most plasticky.
The fit is comparatively slim (I wear a BF size three and it's a touch tight in the chest, but just fine in the waist). Some have said the sleeves are long, but I actually have mine shortened at the shoulder. They do shrink considerably.
I'm happy that they're now available in non-BD collars.