I swear those things have hurt me so much, I have no idea either. There was one that came with a used expensive chair I bought. I thought I was sitting in it wrong or something because I felt like I had severe back pains after just a few days.

Ok I agree but there's a caveat. If you've got a gaming setup or other situation where you want your chair to lean back (usually a knob an office chair has), then the lumbar pillow is great for gaming/theater mode