Upon first use, a frank impression of quality, strength and durability. A beautiful product. Very easy and quick to fold and unfold. Perfectly well thought out. First use during the Festival of Lights in Lyon (so a long evening in the crowd stomping and cold). Once folded, compact. Even in the dense crowd, it did not bother me. So easy to fold and unfold, as I was putting between uses, and hop in his pocket on the back. Very stable, with no need to tighten anything by being afraid to break everything. No need to force to squeeze the ball until the complete immobility. As for the weight, it is correct for that quality. Yes, at the end of the evening, we begin to feel a little, but not insurmountable, even for a not very sporty person like me. Highly recommended!