The build quality is high before in order. Operation is simple. The operating noise is a faint purr. Cracking or creaking does nothing in my model. For me, however, the massage effect is very unbalanced. Lower back, lumbar region so the effect is very weak, the balls could also be a good 10 cm deep rotate direction Po to reach the lower lumbar region. From mid-back way up to the shoulder blades, the massaging action is disproportionately strong, the balls burrow straight into the back. And then, just above the shoulder blades, where the neck muscles begins, the action stops again, the balls are hardly felt. The neck gets from nothing.
In my view, the mat is insufficiently formed. It forms a hard, just peel, less of an obligation, as a more a hard seat in located. It makes sense it would have been, so that the lumbar / lower back and shoulders, be better achieved by the massaging effect these shell both in the lumbar region to shape and the shoulders slightly forward and is relieved at the same time in the thoracic vertebra region of the pressure - as it were, so like a good, anatomically shaped office chair or car seat. This mat is just stiff and just not anatomically shaped. Alternatively, should the rotation spheres in the lumbar region increasingly pressing forward, reduce the pressure against the chest.
Thus I am forced as a user to customize the bullets to change my attitude and during the massage process. The effect is still positive afterwards, the muscle then feels more relaxed and less painful. The effect of heat I like that; it is clearly present and felt, the mat is really warm. I am skeptical regarding the three-stage switching vibration in the seat - to the gentle vibration of something to bring out the feeling of sitting in a vehicle with the engine running?
Would I buy again my mat? No. I think there are better models. But I'm not really unhappy, because doing massage effect. One should not expect too much ... only for the price.