Review on Portable Retractable Folding Collapsible Stool by Mike Woolford

I've been watching them in action for a while and thought this would be a good replacement for my high chair. Lighter weight and less bulky. My knees hurt and I can't sit fully on the floor. The third time I set it up to use it sounded like it would explode, I fell back and landed on the floor. It took me a little while to realize what had happened. One of the plastic rings is broken. I had it on level ground and wasn't leaning back or anything. I have to send it back for a replacement but I don't know if I will trust it again.