I was concerned because of some of the negative reviews regarding leaking air. The mattress has not leaked at all. However, some may not know that after filling and capping, the valve will leak unless you tighten the turn screw at the base of the valve. I didn't know it was there until I heard the air leaking from the valve and there was no mention of it in the instructions. It's also black and hard to see. I am very pleased with this mattress.