For the falling-asleep, this means that I must somehow pick the point at the center, which carries me. Once I lie slightly to the side, my weight is no longer supported by the mattress and I slide to the sides. Since I have two of these mattresses are adjacent and then "wegrutsche" I often find myself in this "borderland" between the mattress again. The mattress itself here no longer touch each other, it has resulted in a 10 cm wide gap - can of lying comfort and I will no longer speak.
In conclusion, I can only agree on the meaning and purpose of flexible cushion support surprised just like on the test result of the Stiftung Warentest. In practice, I unfortunately have to have the same experience as customer MICKY and therefore can only advise against a purchase.