First off, the box it came in had me a little nervous... Looked like something designed for kindergartens and preschoolers... However, once I took it out, I realized the thickness of the material, and the size of the thing. I'm super glad I had an adaptor to an air compressor which still took a while to inflate the ball, but little effort... It's enormous.*One negative out of the box was that it seemed to have a waxy feeling to it, and a very odd smell. Almost like that oily, waxy smell some chocolates can get... But slightly more chemical in aroma.As far as strength, and relative size... I spend a lot of time at my desk, it tightens me up after workouts, and I'm not crazy about being so stationary for so many hours at a time, so that's what I purchased this for... To mix between my chair and the ball. I'm 6'5, my feet just touch the floor, working my legs... Sometimes I switch back to the chair to give my legs a break. I'm heavier than most humans, around 270, and thus far, the ball has held up for the time short time I've owned it, hopefully it lasts a while. So the only negative, at this early stage, is that while that smell, and oily feeling, has decreased a little each day, it still, lingers on.Lastly, I've used the ball to stretch out on too, and it just hits my body different than the other two sized balls I own, so while my office looks like a playroom at this point... I'm very happy with my decision to buy each different sized ball.
Rating: [4 of 5 Stars!]