Who can tell me something about Neumann pillow?

Neumann pillow is very expensive, but it is not as effective as advertised, and it is not cost-effective. To treat cervical spondylosis, it is still necessary to push it to relieve the pain. Moreover, the pillow core can be filled with mung bean silkworm excrement, which is much better than any so-called high-tech product, and the cost is low, and the effect is not bad at all compared with this product. Therefore, the so-called high-tech products for cervical pain are of little use, and money can't buy the curative effect.