No, I haven't. I got a cheapo one from Wal-Mart and have had it for almost 2 years. It's NOT burst-resistant and I'm terrified of having it explode on me when I'm doing weight work on it. I use it for pikes, core work, floor work, and the LIGHT weight work in PP/SS. I don't do bench presses or flyes on it. Not only am I scared of my cheapo ball failing me, but I have scoliosis and feel like only part of my spine is supported on the ball during chest work. So I still use my step bench. I don't know if it's a marketing ploy, and since I've never used a burst-resistant ball, I don't know if there is any visible or tangible difference between that and one that isn't. But I sure want to get a burst-resistant one, once mine wears out.
Pinky