I pity those who are consumer oriented and can't escape from that. You don't need anything to practice yoga but time. If you think this cushion will work for you, send me the money and I'll send you an old towel you can sit on. I will even give you a certificate of authenticity saying that if it works for me it'll work for you. There are any number of products out there that will "assist" you with yoga. Most of it is New Age crapola, but to each their own. x
I have nothing but benevolent thoughts for everyone. I don't think a zafu cushion is important for meditation, but if you do, then I'd say go for it. Bottom line is whatever makes you comfortable and is going to keep you practicing is important for you and the rest of creation. I can't sit cross-legged for more than a few minutes without major discomfort so I sit in a chair or lie on my back when meditating (mostly sitting in a chair). However, I also meditate while I walk a mile every day. I also meditate while I commute to and from work in my car. I don't think when and how is as important as the actual doing. Check out those guys in India that stand on one foot or have their arm up in the air for years at a time.
A good cushion can be very important!It helps you to sit relaxed. I sit on a cushion made by Wisdom Travelers! It's the best I ever sat. cushion