We are not fans of yoga, but we saw this advertised and in the description it mentioned it could be used as an addition to furniture, so we thought it might be useful as a smaller ottoman.
The cushion itself seems to be well made. You can hear and feel the buckwheet husks as you mesh it in your hands. When you unzip the cover, you can actually see the husks, as there is no inner lining that holds them, so they can spill out easily (be warned!).
And, it is quite small (about six inches high and 15 inches in diameter). Not really the best size for an ottoman for a living room chair. However, it has come in handy as I have undergone an accident recently and been left with a severely sprained ankle. This pillow is just the right height and is soft enough for my injured ankle to rest gently in while I am sitting doing work at my desk.
Although it is nifty in many ways, I just cannot bring myself to recommend it heartily due to the high price.