Bests & Worsts Reviews from Amazon

I bought the shorter version of this stool and it seemed great, so I bought the 16-inch version. I used it about 3 or 4 times. But I was just on a cement porch (a solid, flat surface) and IT COMPLETELY COLLAPSED UNDER ME! I felt one edge "soften" and it gave way. I'm lucky I wasn't seriously injured! As the directions say, I had both feet firmly planted, I am well under the rated 400 lbs. (I'm 225) and I was on a secure, solid flat surface (concrete). THIS PRODUCT IS DANGEROUS... DO NOT BUY!