I am reviewing the stepper only and not Brenda's attitude on her workout dvd which seemed to bother some reviewers, which is odd.
In any case, the stepper is made of heavy -weight durable "plastic". Unless you abuse this, I can't see how it will lose air. I have been on this 6 days a week, 30 minutes, and it's great. I'm pretty tough on my home equipment so...I rate this as excellent. Maybe it will save you time and money. It has for me.