Instruct: Classify the given Amazon review into positive or negative sentiment.
Query: Not for Lumbar

I've had one of these for a year or so and tried to use it several times. As you can see from the pics of this product, it is not for the lumbar (low back) part of the back. When you hook this onto a chair and lean back on it, it supports your middle back. I've tried to slide it down, shift my sitting position, all to no avail. It pushes me forward in the chair because it takes up space between my middle back and the chair back. Unless I haven't figured out how to use. But so far, it doesn't help with lumbar support at all. Instead of flaring out near the bottom and then in, lumbar support products are the opposite...they flare in near the bottom and then out at the lumbar area. If you notice when you sit in a car seat and push the lumbar buttom or whatever, a section at the very bottom of the seat back pushes OUT toward your low back. That's not what this thing does.