This product is good enough and has robust air. The settings are present and artfully designed but still lacks flexibility (only two heights to the lower part, the upper part is better designed). Actually, I do not feel I have been able to find a configuration that is really comfortable. A system with continuous adjustment march might be more convenient (here we have two notches of adjustment for the lower and 5 for the upper part). So I'm still not 100% convinced of the effectiveness of this product.