Since the size was determined by my height, and I was very close to the dividing line, I chose the smaller one since both claim to support up to 2000 pounds so this would not a factor. At the time I wasn't sure if I could manage to get on a ball that was a bit larger, but in hindsight, I probably should have gotten the larger ball and left it deflated a bit if my legs weren't long enough.
My granddaughter was here when I opened the package and said she loved these balls, and of course wanted to help. She decided she was going to pump the ball up. This was where we ran into trouble because the pump fell apart in her little hands. We put it back together as best we could, and between the two of us, spent the next half an hour trying to pump up the ball while holding the pump together. I left her alone with it for a short time and when I returned from the bathroom, my six year old granddaughter was making a valiant attempt at blowing the ball up without a pump. She managed to get it blown up a considerable amount before giving up for the night. Although she was tired, she refused to give the ball up without a fight, and took the half blown up ball to bed with her.
I was later able to inflate the ball with a different air pump, and was pleased with the quality of the ball itself. It seems to be a very sturdy rubber material, which is supposed to be able to support up to 2000 pounds. I won't try to test that theory, but am pleased to say that I wouldn't feel uncomfortable putting my own weight and the weight of my granddaughter on it. Since I had never used one of these fitness balls before, I wasn't sure what to expect, so it was comforting to know that their anti-burst claim is there.
I recently re-injured my knee and am pretty unsteady, so haven't gotten much of a chance to really test this out thoroughly, but so far it seems to be a nice product. My granddaughter went through the included exercise sheet and demonstrated every exercise listed, although she refused to allow me to take pictures to post along with my review. Hopefully I will be back on my feet a little more soon and feel more comfortable attempting some of these new exercises. I did not deduct any stars for the pump since this was a free gift included with the purchase of the ball, and the ball seems very sturdy.
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Although I got this product at a discount or received a complimentary sample in exchange for my honest review, all thoughts and opinions on the products I review are always my own and have not been influenced by any discounts or samples which may have been provided to me.