Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Works as intended, but could use some improvements

Hello,I have a bad back (from a car accident) and need to maintain back and stomach strength to avoid constant pain and fatigue. I purchased this Hyperbench instead of a roman chair. I figured it would supply the same exercise in a smaller more versatile package.The product does allow me to do my much needed exercises, however it does have two flaws that bother me.Issue #1: it is very narrow and light so when I do my back bend or situps, sometimes it feels like the Hyperbench may tip over to the side with me on it (better for skinny people or people not over 6 foot tall).Issue# 2: the pins do not lock in place so they can easily fall out collapsing the hyperbench on your foot or possibly while you are on it. This is unlikely to happen but it is possible so I figured I would mention it.Overall I like the product and it does what is says, but if you are taller than 6 foot or heavier than 200 pounds, I do not recommend it.-Geo