I've bought a bunch of brands of these before and I've only had one burst and one that was a crazy size. I've owned 10,20,25,30,40,50,60,and 100 pound versions of them. They tend to be slippy when they arrive and deflate over time but a bike pump makes them good as new. I think it is an underrated piece of gym equipment and I'm guessing that they all come from the same factory in China if I didn't know any better....I recommend buying any of them but I'd personally shop around.
Performance
Value
Build Quality