Rating: - solid ball
When I was a personal trainer, I used these with my clients. Fantastic product. The only thing is, I disagree with their sizing chart. I think you out to go with a size or two smaller than the height chart calls for. You want your knees to be bent at a 90 degree angle when you are sitting on the ball to allow for maximum benefit and full range of motion (if you're going to actually be using the ball to exercise, and not just bounce on when you're bored).

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Rating: - Excellent ball, but know how to inflate properly
I bought two of these Thera Band exercise balls. My electric air pump would inflate them 10-15cm (in diameter) short of the target size. I was afraid I might burst the ball. After some hunting online, we learned we needed to use an air compressor. It worked like magic.

I would disagree with the other reviewers who claim the balls aren't big enough. They are, but you need an air compressor. This is a very high quality product, much thicker than my previous exercise ball.

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Rating: - Good product; good customer service
When I received this item and had my husband inflate the ball, we found that the air valve was defective. I called customer service and they immediately shipped out a replacement ball along with a postage paid label for me to return the defective ball. The new ball is just fine, and is suited to my height. Overall, I am very satisfied with it and with the company that sent me the ball.

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Rating: - Great Customer service!
I received the wrong ball. They shipped out a new one and paid the postage for the return...Great Service...

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Rating: - good customer service, good product
I originally recieved a defective product, but the customer service perople were very helpful and immediately sent me out antother ball (before I returned the first one). The second ball inflated easily to the true size described and it is very sturdy. I am pleased with this purchase and would recommend this product.