As it turned out, I did bring it with me to Nepal and used it as a pillow at night but did not sit too much - our days there were filled with trekking and eating, and sleeping. That evening I realized that he had been carrying the inflatable zafu, and still had it. I forgot to retrieve it from him. Regards, and thank you for your fine product. However, usually after a minute or two you forget you are sitting on an air.
Some people like it so much they use it as their every day cushion even at home.
But most people consider it a travel cushion. It looks almost just like a regular zafu. Also, the cover is machine-washable. They are carried all over the backcountry and used for camping with great results. Most balls last for years with occasional use.