Bests & Worsts Reviews from Amazon

Recently, my cheap-o balance ball encountered a tear, and deflated quickly. It was technically a 75 cm ball, so I figured that's the size I would need for a replacement. I mainly use this ball for a desk chair, for reference. However, when I searched my particular ball online (I originally bought it in store, with no reviews), I read complaints that the 75 cm was really a 65 cm. Then, I found this Gaiam ball kit, and was very frustrated when reading the reviews, because every other review said that the ball was "way too small." I read nearly every review on the actual Gaiam website, as well, and started to believe that people were just not inflating the ball correctly. You definitely need to let it rest between sessions of inflation - then it will get to the proper size. I measured mine against both a comfortably high chair, as well as on it's own, and in comparison to my old ball when fully inflated (which was perfect). After blowing the Gaiam ball up, letting it rest, and inflating it again, it was the perfect size. I couldn't believe that I had to spend so many hours researching the correct sizing for a big, inflatable, ball, but I'm glad I did because I did not have to send my ball back for a better size - even as used as a desk chair. For reference (which I think is very important when taking all reviews into account, as far as this ball goes), I am: 5'7" 125lbs 33" inseam (crazy that this impacts the "fit," but it does) I use this ball as a desk chair I am lowering the system one star, only because it would be nice to be able to choose the color one wants, rather than color by size. In my instance, it actually worked out, because I wanted the green ball (which is why I ultimately decided to go with my gut and get the 'correct' size for my height), but if it were too small, I would have been stuck with the large blue one. I sincerely hope this helps, because I know how frustrating and confusing the backstory on these balls is.