Bought this back in 2012, and it's pretty much the same as it was back then. Easy to inflate and holds the air for a long time. I've only had to reinflate it once during this entire time.

I bought the 75 cm ball and I've used it for a few months now, the ball has maintained it's proper size and pressure and functions as a situp ball only for me. It seems well made and will last for years. The only problem with it is the cheaply made, useless pump that they included would take days to pump up, so I used my electric air pump to do the job. Remember to pump it up about 80% then let it sit for 24 hours, then pump it up to the correct size ( they provide a tape measure to check). If you don't do it this way it will form an egg shape and won't be round. This is key.

I'm writing this review to pay my respects to this remarkable ball, on which I am presently sitting as I write. I bought the GoFit 75cm commercial grade Pro Ball literally TEN YEARS AGO. It has traveled with me across three states, two degrees, and a decade of life, and it still holds my 190 lbs without leaking any air. I filled it with air when I moved into my last apartment, and after two years of use it was still fully inflated. I suspect that they will soon uncover a hidden chamber in the pyramids, and inside there will be one of these balls, still inflated and usable from 3000 years ago...

Had one of these brands for 10 years before my kids busted it. I bought a different brand ball and it lasted all of 2 weeks. Bought this brand again and should have from the start. Material is thicker than the other balls, and it's made to last. No complaints at all.

It feels very sturdy, and after the first week or so, I haven't needed to add any more air (~4 months, if not longer). The excercises on the ball itself are nice - you don't need to consult a booklet when you want a spontaneous workout.