Balance Ball & Base Kit, Yoga Ball Chair, Exercise Ball with Inflatable Ring Base for Home or Office Desk, Includes Air Pump

Customers find the balance ball to be of good quality and effective for balance training, with one customer reporting reduced back pain. The size is smaller than expected, and while the ball is easy to inflate, it doesn't reach the full diameter. Customers report durability issues, with one mentioning the base popping after 4 days of use. The stability receives mixed feedback, with some finding it solid while others report it rolling around the room, and air retention is a concern as the ball starts losing air.