Instruct: Classify the given Amazon review as either positive or negative.
Query: Fell apart on fourth use..........poor quality

I'm a larger person but weigh less than the upper range rating listed for this chair. Although it seated comfortably the first three uses, on the fourth use a critical "plastic" part snapped making the chair useless. I'll be applying for relief under the 2 yr. waranty, but I found it incongruous that a chair made of powder coated steel for strength depended on a small, thin piece of plastic less than a 1/2 in. in width?? Why wouldn't all parts be similarly designed for strength.