Kuseno pillows, at their heart, are buckwheat shells in a pillow case. High quality craftsmanship is just the start of it. Each pillow is zipped so you can add or remove the hulls as you want to for a customized experience. They're heavier than a normal pillow, but they are squooshier as well. I liken them to sleeping on a beanbag, without the lumps.
I can't speak for anyone else, but when I sleep, I normally wake up every forty minutes to an hour, get up to move around due to pain, then go back to bed, readjust my pillow and try to get back to sleep. That getting back to sleep can normally take between ten and fifteen minutes. Since switching to a Kuseno pillow, I don't have to adjust the pillow, I just have to fall on my bed and am go back to sleep. My stiff neck and vague headaches on waking up are a thing of the past .
If you enjoy a firm pillow, Kuseno is perfect for you out of the gate. I, personally, like a bit of sponge to my pillow, so I slipped a flattened cheap pillow into the case and it's perfect. The buckwheat holds the shape I want, the much abused cheapy pillow, adds a bit of softness and I sleep as well as I have since before I first met fibromyalgia.
I give Kuseno pillows a very big thumbs up, and not just because they'd probably give a great whumpf in a pillow fight.. and it's gluten free. ;)