I’ve used millet pillows for years, but after awhile they start to flatten. The same thing will happen with Buckwheat as well. The main difference is the container that will hold the material. Weak zippers and no way to protect the zipper has been the main failure (for me). The zipper is robust on this and takes intention to get it to move. This is what is making me right now a believer in this company.
I would recommend Hullo to a friend.