Instruct: Classify the given Amazon review as either positive or negative.
Query: Useless with office chairs

I bought this to use with my office chair. To my disappointment, the cushion is so big that it takes up most of the seat! I'm forced to sit on the edge of my chair, which is very uncomfortable. I tried it on a couple other kinds of office chairs, and it was the same story each time.Maybe this cushion would work well if you have a chair with a fairly deep seat, so you can still sit back against the cushion. But for any of the fairly standard office chairs I tried it with, it was impossible to use!