Of the pillow but are not rotating only the massage heads noticeable but also different edges of the control unit inside - both at the top and at the bottom. A better cushioning you can of course also be retrofitted itself, however, the manufacturer has better opportunities here, especially also because the heat dissipation of the motor or the whole unit should certainly be guaranteed.
The distance between the two rotating massage heads, each provided with a smaller and a larger ball is flattened, not adjustable and therefore the pad does not fit perfectly with each. In addition, the massage strength solely by the pressure of the body is dependent, in chairs that can be painful due to the location already. (Countermeasure below)
The heating function is minimal and noticeable only after a short running time, and then only if the Knetköpfe are not additionally covered. The device is also activated without heat function solely by the friction occurring, a bit warm.
For a Healthy massage while lying, it is advisable to place each another matching pillows or other suitable surface before and after the massage cushion, then interfere with the metallic edge not more so. For a neck massage but I would already recommend an additional padding of massage cushion, otherwise it is possible with the relaxation there.
All in all, the device is not bad, it could only tolerate one or other improvement. One must also quite mention that this device is the most effective of its kind. A decisive criterion for me was that this device can also be used while lying down. In this position, a relaxing but now is really the best possible.