Instruct: Classify the given Amazon review into positive or negative sentiment.
Query: Bought this for work.

I bought this item for work because not sitting up properly was causing side pains. I never had a problem with the mesh support, seeing as how it was there more as a reminder to sit up straight as opposed to something I would actually lean against. My problem was that with a standard office chair (like the one shown in the picture) the product would slide down and fall into the space between the back rest and the seat. And, once the elastic gets stretched out (which happens fairly soon) it makes the product virtually useless.