For years I have done daily exercises for back issues. I use a larger exercise ball for some of the activities. When I am traveling whether visiting family or for work rather than foregoing some of the exercises this little peanut does the trick. Convenient for traveling, I can deflate and bring the pump with me or just put in the bag. It takes up very little space. I sometimes use it for back support on long drives to prevent me from slouching. For something so small, it is quite sturdy to support the weight that placed on it. I like it and would recommend it to others for back and core exercises.
Not sure if this is helpful. I weight a little under 200 lbs and have used it for several months with no issues. I do not stand on it or do any exercises other than core / back exercises or for stretching.